Title: 07. Arrays
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07\. Arrays | PPT
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07\. Arrays
===========
Mar 18, 2020Download as PPTX, PDF0 likes94,245 views
[ Intro C# Book](https://www.slideshare.net/introprogramming "Intro C# Book")Follow
In this chapter we will learn about arrays as a way to work with sequences of elements of the same type. We will explain what arrays are, how we declare, create, instantiate and use them. We will examine one-dimensional and multidimensional arrays. We will learn different ways to iterate through the array, read from the standard input and write to the standard output. We will give many example exercises, which can be solved using arrays and we will show how useful they really are.Read less
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![Image 7: 5
The days of week can be stored in array of strings:
Days of Week Example
string[] days = {
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
"Sunday"
};
Expression Value
days[0] Monday
days[1] Tuesday
days[2] Wednesday
days[3] Thursday
days[4] Friday
days[5] Saturday
days[6] Sunday
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-5-320.jpg)
![Image 8: 6
Enter a day number [17] and print the day name (in English) or
"Invalid day!"
Problem: Day of Week
string[] days = { "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday", "Sunday" };
int day = int.Parse(Console.ReadLine());
if (day >= 1 && day <= 7)
Console.WriteLine(days[day - 1]);
else
Console.WriteLine("Invalid day!");
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#0
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-6-320.jpg)
![Image 9: 7
Allocating an array of 10 integers:
Assigning values to the array elements:
Accessing array elements by index:
Working with Arrays
int[] numbers = new int[10];
for (int i = 0; i < numbers.Length; i++)
numbers[i] = 1;
numbers[5] = numbers[2] + numbers[7];
numbers[10] = 1; // IndexOutOfRangeException
All elements are
initially == 0
The Length holds
the number of
array elements
The [] operator accesses
elements by index
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-7-320.jpg)
![Image 10: 8
Write a program to find all prime numbers in range [0n]
Sieve of Eratosthenes algorithm:
1. primes[0n] = true
2. primes[0] = primes[1] = false
3. Find the smallest p, which
holds primes[p] = true
4. primes[2*p] = primes[3*p] =
primes[4*p] = = false
5. Repeat for the next smallest p
Problem: Sieve of Eratosthenes
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-8-320.jpg)
![Image 11: 9
Solution: Sieve of Eratosthenes
var n = int.Parse(Console.ReadLine());
bool[] primes = new bool[n + 1];
for (int i = 0; i <= n; i++) primes[i] = true;
primes[0] = primes[1] = false;
for (int p = 2; p <= n; p++)
if (primes[p]) FillPrimes(primes, p);
static void FillPrimes(bool[] primes, int step)
{
for (int i = 2 * step; i < primes.Length; i += step)
primes[i] = false;
}
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#1
TODO: print the
calculated prime
numbers at the end
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-9-320.jpg)
![Image 13: 11
Solution: Last K Numbers Sums
var n = int.Parse(Console.ReadLine());
var k = int.Parse(Console.ReadLine());
var seq = new long[n];
seq[0] = 1;
for (int current = 1; current < n; current++)
{
var start = Math.Max(0, current - k);
var end = current - 1;
long sum = // TODO: sum the values of seq[start end]
seq[current] = sum;
}
// TODO: print the sequence seq[]
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#2
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-11-320.jpg)
![Image 16: 14
First, read from the console the length of the array:
Next, create the array of given size n and read its elements:
Reading Arrays From the Console
int n = int.Parse(Console.ReadLine());
int[] arr = new int[n];
for (int i = 0; i < n; i++)
{
arr[i] = int.Parse(Console.ReadLine());
}
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-14-320.jpg)
![Image 18: 16
Solution: Sum, Min, Max, First, Last, Average
using System.Linq;
var n = int.Parse(Console.ReadLine());
var nums = new int[n];
for (int i = 0; i < n; i++)
nums[i] = int.Parse(Console.ReadLine());
Console.WriteLine("Sum = {0}", nums.Sum());
Console.WriteLine("Min = {0}", nums.Min());
// TODO: print also max, first, last and average values
Use System.Linq to enable aggregate
functions like .Max() and .Sum()
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#3
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-16-320.jpg)
![Image 19: 17
Arrays can be read from a single line of space separated values:
Or even write the above as a single line of code:
Reading Array Values from a Single Line
string values = Console.ReadLine();
string[] items = values.Split(' ');
int[] arr = new int[items.Length];
for (int i = 0; i < items.Length; i++)
arr[i] = int.Parse(items[i]);
int[] arr = Console.ReadLine().Split(' ')
.Select(int.Parse).ToArray();
2 8 30 25 40 72 -2 44 56
string.Split(' ')
splits string by space
and produces string[]
Use System.Linq to
enable .Select()
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-17-320.jpg)
![Image 21: 19
Solution: Triple Sum (a + b == c)
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#4
int[] nums = Console.ReadLine().Split(' ')
.Select(int.Parse).ToArray();
for (int i = 0; i < nums.Length; i++)
for (int j = i + 1; j < nums.Length; j++)
{
int a = nums[i];
int b = nums[j];
int sum = a + b;
if (nums.Contains(sum))
Console.WriteLine($"{a} + {b} == {sum}");
}
TODO: print "No"
when no triples
are found
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-19-320.jpg)
![Image 23: Printing Arrays on the Console
To print all array elements, a for-loop can be used
Separate elements with white space or a new line
Example:
string[] arr = {"one", "two", "three", "four", "five"};
// Process all array elements
for (int index = 0; index < arr.Length; index++)
{
// Print each element on a separate line
Console.WriteLine("arr[{0}] = {1}", index, arr[index]);
}
21
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-21-320.jpg)
![Image 25: 23
Solution: Rounding Numbers
Rounding turns each value to the nearest integer
What to do when the value is exactly between two integers?
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#5
double[] nums = Console.ReadLine()
.Split(' ').Select(double.Parse).ToArray();
int[] roundedNums = new int[nums.Length];
for (int i = 0; i < nums.Length; i++)
roundedNums[i] = (int) Math.Round(nums[i],
MidpointRounding.AwayFromZero);
for (int i = 0; i < nums.Length; i++)
Console.WriteLine($"{nums[i]} -> {roundedNums[i]}");
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-23-320.jpg)
![Image 26: Printing with foreach / String.Join()
Use foreach-loop:
Use string.Join(separator, array):
int[] arr = { 1, 2, 3 };
Console.WriteLine(string.Join(", ", arr)); // 1, 2, 3
string[] strings = { "one", "two", "three", "four" };
Console.WriteLine(string.Join(" - ", strings));
// one - two - three - four
24
int[] arr = { 10, 20, 30, 40, 50};
foreach (var element in arr)
Console.WriteLine(element)
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-24-320.jpg)
![Image 28: 26
Solution: Reverse Array
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#6
var nums = Console.ReadLine()
.Split(' ').Select(int.Parse).ToArray();
for (int i = 0; i < nums.Length / 2; i++)
SwapElements(nums, i, nums.Length - 1 - i);
Console.WriteLine(string.Join(" ", nums));
static void SwapElements(int[] arr, int i, int j)
{
var oldElement = arr[i];
arr[i] = arr[j];
arr[j] = oldElement;
}
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-26-320.jpg)
![Image 33: 31
Solution: Sum Arrays
var arr1 = Console.ReadLine()
.Split(' ').Select(int.Parse).ToArray();
var arr2 = // TODO: read the second array of integers
var n = Math.Max(arr1.Length, arr2.Length);
var sumArr = new int[n];
for (int i = 0; i < n; i++)
sumArr[i] =
arr1[i % arr1.Length] +
arr2[i % arr2.Length];
Console.WriteLine(string.Join(" ", sumArr));
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#7
Loop the array: end start
arr[len] arr[0]
arr[len+1] arr[1]
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-31-320.jpg)
![Image 35: 33
Solution: Condense Array to Number
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#8
int[] nums = Console.ReadLine()
.Split(' ').Select(int.Parse).ToArray();
while (nums.Length > 1)
{
int[] condensed = new int[nums.Length - 1];
for (int i = 0; i < nums.Length - 1; i++)
condensed[i] = // TODO: sum nums
nums = condensed;
}
Console.WriteLine(nums[0]);
2 10 3
12 13
0 1 2
nums[] :
condensed[] :
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-33-320.jpg)
![Image 37: 35
Solution: Extract Middle 1, 2 or 3 Elements
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#9
static int[] ExtractMiddleElements(int[] arr)
{
int start = arr.Length / 2 - 1;
int end = start + 2;
if (arr.Length == 1) start = end = 0;
else if (arr.Length % 2 == 0) end--;
int[] mid = new int[end - start + 1];
// Copy arr[start end] mid[]
return mid;
}
1 2 3 4 5 6 7
start end
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-35-320.jpg)
![Image 39: 37
Solution: Largest Common End
Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#10
static int LargestCommonEnd(
string[] words1, string[] words2)
{
var rightCount = 0;
while (rightCount < words1.Length &&
rightCount < words2.Length)
if (words1[words1.Length - rightCount - 1] ==
words2[words2.Length - rightCount - 1])
rightCount++;
else break;
return rightCount;
}
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-37-320.jpg)
![Image 43: 41
Arrays hold sequence of elements
Elements are numbered from 0 to length-1
Creating (allocating) an array:
Accessing array elements by index:
Printing array elements:
Summary
int[] numbers = new int[10];
numbers[5] = 10;
Console.Write(string.Join(" ", arr));
](https://image.slidesharecdn.com/2-200318130713/85/07-Arrays-41-320.jpg)
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07\. Arrays
-----------
* 1\. [Arrays Processing Sequences of](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#1) Elements SoftUni Team Technical Trainers Software University http://softuni.bg
* 2\. [Table of Contents 1.](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#2) Defining, Initializing and Processing Arrays 2. Reading Arrays from the Console Using for Loop to Read Arrays Using String.Split() 3. Printing Arrays at the Console Using the foreach Loop Using String.Join() 4. Arrays Exercises 2
* 3\. [Arrays Working with Arrays](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#3) of Elements
* 4\. [What are Arrays? ](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#4) In programming array is a sequence of elements Elements are numbered from 0 to Length-1 Elements are of the same type (e.g. integers) Arrays have fixed size (Array.Length) cannot be resized 4 0 1 2 3 4 Array of 5 elements Element index Element of an array
* 5\. [5 The days](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#5) of week can be stored in array of strings: Days of Week Example string\[\] days = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" }; Expression Value days\[0\] Monday days\[1\] Tuesday days\[2\] Wednesday days\[3\] Thursday days\[4\] Friday days\[5\] Saturday days\[6\] Sunday
* 6\. [6 Enter a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#6) day number \[17\] and print the day name (in English) or "Invalid day!" Problem: Day of Week string\[\] days = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" }; int day = int.Parse(Console.ReadLine()); if (day \>\= 1 && day <\= 7) Console.WriteLine(days\[day - 1\]); else Console.WriteLine("Invalid day!"); Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#0
* 7\. [7 Allocating an](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#7) array of 10 integers: Assigning values to the array elements: Accessing array elements by index: Working with Arrays int\[\] numbers = new int\[10\]; for (int i = 0; i < numbers.Length; i++) numbers\[i\] = 1; numbers\[5\] = numbers\[2\] + numbers\[7\]; numbers\[10\] = 1; // IndexOutOfRangeException All elements are initially == 0 The Length holds the number of array elements The \[\] operator accesses elements by index
* 8\. [8 Write a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#8) program to find all prime numbers in range \[0n\] Sieve of Eratosthenes algorithm: 1. primes\[0n\] = true 2. primes\[0\] = primes\[1\] = false 3. Find the smallest p, which holds primes\[p\] = true 4. primes\[2\*p\] = primes\[3\*p\] = primes\[4\*p\] = = false 5. Repeat for the next smallest p Problem: Sieve of Eratosthenes
* 9\. [9 Solution: Sieve of](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#9) Eratosthenes var n = int.Parse(Console.ReadLine()); bool\[\] primes = new bool\[n + 1\]; for (int i = 0; i <\= n; i++) primes\[i\] = true; primes\[0\] = primes\[1\] = false; for (int p = 2; p <\= n; p++) if (primes\[p\]) FillPrimes(primes, p); static void FillPrimes(bool\[\] primes, int step) { for (int i = 2 \* step; i < primes.Length; i += step) primes\[i\] = false; } Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#1 TODO: print the calculated prime numbers at the end
* 10\. [10 Enter two](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#10) integers n and k Generate and print the following sequence: The first element is: 1 All other elements = sum of the previous k elements Example: n = 9, k = 5 120 = 4 + 8 + 16 + 31 + 61 Problem: Last K Numbers Sums 6 3 Sequence: 1 1 2 4 7 13 8 2 Sequence: 1 1 2 3 5 8 13 21 9 5 Sequence: 1 1 2 4 8 16 31 61 120 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#2 1 1 2 4 8 16 31 61 120 +
* 11\. [11 Solution: Last K](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#11) Numbers Sums var n = int.Parse(Console.ReadLine()); var k = int.Parse(Console.ReadLine()); var seq = new long\[n\]; seq\[0\] = 1; for (int current = 1; current < n; current++) { var start = Math.Max(0, current - k); var end = current - 1; long sum = // TODO: sum the values of seq\[start end\] seq\[current\] = sum; } // TODO: print the sequence seq\[\] Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#2
* 12\. [Working with Arrays Live](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#12) Exercises in Class (Lab)
* 13\. [Reading Arrays from](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#13) the Console Using String.Split() and Select()
* 14\. [14 First, read](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#14) from the console the length of the array: Next, create the array of given size n and read its elements: Reading Arrays From the Console int n = int.Parse(Console.ReadLine()); int\[\] arr = new int\[n\]; for (int i = 0; i < n; i++) { arr\[i\] = int.Parse(Console.ReadLine()); }
* 15\. [15 Write a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#15) program to read n integers and print their sum, min, max, first, last and average values: Problem: Sum, Min, Max, First, Last, Average Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#3 5 12 20 -5 37 8 Sum = 72 Min = -5 Max = 37 First = 12 Last = 8 Average = 14.4 4 50 20 25 40 Sum = 135 Min = 20 Max = 50 First = 50 Last = 40 Average = 33.75
* 16\. [16 Solution: Sum, Min,](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#16) Max, First, Last, Average using System.Linq; var n = int.Parse(Console.ReadLine()); var nums = new int\[n\]; for (int i = 0; i < n; i++) nums\[i\] = int.Parse(Console.ReadLine()); Console.WriteLine("Sum = {0}", nums.Sum()); Console.WriteLine("Min = {0}", nums.Min()); // TODO: print also max, first, last and average values Use System.Linq to enable aggregate functions like .Max() and .Sum() Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#3
* 17\. [17 Arrays can](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#17) be read from a single line of space separated values: Or even write the above as a single line of code: Reading Array Values from a Single Line string values = Console.ReadLine(); string\[\] items = values.Split(' '); int\[\] arr = new int\[items.Length\]; for (int i = 0; i < items.Length; i++) arr\[i\] = int.Parse(items\[i\]); int\[\] arr = Console.ReadLine().Split(' ') .Select(int.Parse).ToArray(); 2 8 30 25 40 72 -2 44 56 string.Split(' ') splits string by space and produces string\[\] Use System.Linq to enable .Select()
* 18\. [18 Write a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#18) program to read an array of integers and find all triples of elements a, b and c, such that a + b == c (a stays left from b) Problem: Triple Sum (a + b == c) 1 1 1 1 No 4 2 8 6 4 + 2 == 6 2 + 6 == 8 3 1 5 6 1 2 3 + 2 == 5 1 + 5 == 6 1 + 1 == 2 1 + 2 == 3 5 + 1 == 6 1 + 2 == 3 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#4 2 7 5 0 2 + 5 == 7 2 + 0 == 2 7 + 0 == 7 5 + 0 == 5
* 19\. [19 Solution: Triple Sum](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#19) (a + b == c) Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#4 int\[\] nums = Console.ReadLine().Split(' ') .Select(int.Parse).ToArray(); for (int i = 0; i < nums.Length; i++) for (int j = i + 1; j < nums.Length; j++) { int a = nums\[i\]; int b = nums\[j\]; int sum = a + b; if (nums.Contains(sum)) Console.WriteLine($"{a} + {b} == {sum}"); } TODO: print "No" when no triples are found
* 20\. [Printing Arrays at](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#20) the Console Using foreach and String.Join()
* 21\. [Printing Arrays on](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#21) the Console To print all array elements, a for-loop can be used Separate elements with white space or a new line Example: string\[\] arr = {"one", "two", "three", "four", "five"}; // Process all array elements for (int index = 0; index < arr.Length; index++) { // Print each element on a separate line Console.WriteLine("arr\[{0}\] = {1}", index, arr\[index\]); } 21
* 22\. [22 Problem: Rounding Numbers ](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#22) Read an array of real numbers (space separated values), round them in "away from 0" style and print the output as in the examples: 0.9 1.5 2.4 2.5 3.14 0.9 =\> 1 1.5 =\> 2 2.4 =\> 2 2.5 =\> 3 3.14 =\> 3 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#5 -5.01 -1.599 -2.5 -1.50 0 -5.01 =\> -5 -1.599 =\> -2 -2.5 =\> -3 -1.50 =\> -2 0 =\> 0
* 23\. [23 Solution: Rounding Numbers ](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#23) Rounding turns each value to the nearest integer What to do when the value is exactly between two integers? Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#5 double\[\] nums = Console.ReadLine() .Split(' ').Select(double.Parse).ToArray(); int\[\] roundedNums = new int\[nums.Length\]; for (int i = 0; i < nums.Length; i++) roundedNums\[i\] = (int) Math.Round(nums\[i\], MidpointRounding.AwayFromZero); for (int i = 0; i < nums.Length; i++) Console.WriteLine($"{nums\[i\]} -\> {roundedNums\[i\]}");
* 24\. [Printing with foreach](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#24) / String.Join() Use foreach-loop: Use string.Join(separator, array): int\[\] arr = { 1, 2, 3 }; Console.WriteLine(string.Join(", ", arr)); // 1, 2, 3 string\[\] strings = { "one", "two", "three", "four" }; Console.WriteLine(string.Join(" - ", strings)); // one - two - three - four 24 int\[\] arr = { 10, 20, 30, 40, 50}; foreach (var element in arr) Console.WriteLine(element)
* 25\. [25 Read an](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#25) array of strings (space separated values), reverse it and print its elements: Reversing array elements: Problem: Reverse Array Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#6 1 2 3 4 5 5 4 3 2 1 -1 20 99 5 5 99 20 -1 1 2 3 4 5 exchange
* 26\. [26 Solution: Reverse Array Check](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#26) your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#6 var nums = Console.ReadLine() .Split(' ').Select(int.Parse).ToArray(); for (int i = 0; i < nums.Length / 2; i++) SwapElements(nums, i, nums.Length - 1 - i); Console.WriteLine(string.Join(" ", nums)); static void SwapElements(int\[\] arr, int i, int j) { var oldElement = arr\[i\]; arr\[i\] = arr\[j\]; arr\[j\] = oldElement; }
* 27\. [27 Another solution](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#27) to the "reverse array" problem: Or even shorter (without parsing strings to numbers): Solution: Reverse Array Functional Style Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#6 Console.WriteLine(string.Join(" ", Console.ReadLine().Split(' ').Select(int.Parse) .Reverse().ToArray())); Console.WriteLine(string.Join(" ", Console.ReadLine().Split(' ').Reverse()));
* 28\. [Reading and Printing](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#28) Arrays Live Exercises in Class (Lab)
* 29\. [Arrays Exercises](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#29)
* 30\. [30 Write a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#30) program that reads two arrays of integers and sums them When elements are less, duplicate the smaller array a few times Problem: Sum Arrays 1 2 3 4 2 3 4 5 3 5 7 9 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#7 1 2 3 4 5 2 3 3 5 5 7 7 1 2 3 4 5 2 3 2 3 2 5 4 3 2 3 1 4 7 7 4 9 5 4 3 5 2 3 1 4
* 31\. [31 Solution: Sum Arrays var](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#31) arr1 = Console.ReadLine() .Split(' ').Select(int.Parse).ToArray(); var arr2 = // TODO: read the second array of integers var n = Math.Max(arr1.Length, arr2.Length); var sumArr = new int\[n\]; for (int i = 0; i < n; i++) sumArr\[i\] = arr1\[i % arr1.Length\] + arr2\[i % arr2.Length\]; Console.WriteLine(string.Join(" ", sumArr)); Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#7 Loop the array: end start arr\[len\] arr\[0\] arr\[len+1\] arr\[1\]
* 32\. [32 Reads an](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#32) array of integers and condense them by summing adjacent couples of elements until a single integer is obtained: Problem: Condense Array to Number 2 4 1 2 6 5 3 11 8 19 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#8 2 10 3 12 13 25 5 0 4 1 2 5 4 5 3 9 9 8 18 17 35
* 33\. [33 Solution: Condense Array](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#33) to Number Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#8 int\[\] nums = Console.ReadLine() .Split(' ').Select(int.Parse).ToArray(); while (nums.Length \> 1) { int\[\] condensed = new int\[nums.Length - 1\]; for (int i = 0; i < nums.Length - 1; i++) condensed\[i\] = // TODO: sum nums nums = condensed; } Console.WriteLine(nums\[0\]); 2 10 3 12 13 0 1 2 nums\[\] : condensed\[\] :
* 34\. [34 Write a](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#34) method to extract the middle 1, 2 or 3 elements from array of n integers n = 1 1 element even n 2 elements odd n 3 elements Read n integers from the console and print the middle elements Problem: Extract Middle 1, 2 or 3 Elements 1 2 3 4 5 6 7 { 3, 4, 5 } 2 3 8 1 7 4 { 8, 1 } 5 { 5 } Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#9 2 8 12 7 3 4 5 33 -2 8 22 4 { 4, 5 }
* 35\. [35 Solution: Extract Middle](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#35) 1, 2 or 3 Elements Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#9 static int\[\] ExtractMiddleElements(int\[\] arr) { int start = arr.Length / 2 - 1; int end = start + 2; if (arr.Length == 1) start = end = 0; else if (arr.Length % 2 == 0) end--; int\[\] mid = new int\[end - start + 1\]; // Copy arr\[start end\] mid\[\] return mid; } 1 2 3 4 5 6 7 start end
* 36\. [36 Read two](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#36) arrays of words and find the length of the largest common end (left or right) Problem: Largest Common End hi php java csharp sql html css js hi php java js softuni nakov java learn 3 hi php java xml csharp sql html css js nakov java sql html css js 4 I love programming Learn Java or C#? 0 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#10
* 37\. [37 Solution: Largest Common](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#37) End Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#10 static int LargestCommonEnd( string\[\] words1, string\[\] words2) { var rightCount = 0; while (rightCount < words1.Length && rightCount < words2.Length) if (words1\[words1.Length - rightCount - 1\] == words2\[words2.Length - rightCount - 1\]) rightCount++; else break; return rightCount; }
* 38\. [Arrays Exercises Live](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#38) Exercises in Class (Lab)
* 39\. [39 Read an](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#39) array of 4\*k integers, fold it like shown below, and print the sum of the upper and lower rows (2\*k integers): Homework: Fold and Sum 1 2 3 4 5 6 7 8 Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#11 2 1 8 7 3 4 5 6 5 5 13 13 4 3 -1 2 5 0 1 9 8 6 7 -2 -1 3 4 -2 7 6 2 5 0 1 9 8 1 8 4 -1 16 14 5 2 3 6 5 6 2 3 7 9 3 4 5 6 3 4 5 6
* 40\. [40 Read an](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#40) array of n integers and an integer k. Rotate the array right k times and sum the obtained arrays as shown below: Homework: Rotate and Sum Check your solution here: https://judge.softuni.bg/Contests/Practice/Index/172#12 3 2 4 -1 2 -1 3 2 4 4 -1 3 2 3 2 5 6 1 2 3 1 3 1 2 3 1 2 1 2 3 4 5 3 5 1 2 3 4 4 5 1 2 3 3 4 5 1 2 12 10 8 6 9
* 41\. [41 Arrays hold](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#41) sequence of elements Elements are numbered from 0 to length-1 Creating (allocating) an array: Accessing array elements by index: Printing array elements: Summary int\[\] numbers = new int\[10\]; numbers\[5\] = 10; Console.Write(string.Join(" ", arr));
* 42\. [? Arrays https://softuni.bg/courses/programming-basics/](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#42)
* 43\. [License This course](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#43) (slides, examples, demos, videos, homework, etc.) is licensed under the "Creative Commons Attribution- NonCommercial-ShareAlike 4.0 International" license Attribution: this work may contain portions from "Fundamentals of Computer Programming with C#" book by Svetlin Nakov & Co. under CC-BY-SA license 43
* 44\. [Free Trainings @](https://www.slideshare.net/slideshow/07-arrays-230464148/230464148#44) Software University Software University Foundation softuni.org Software University High-Quality Education, Profession and Job for Software Developers softuni.bg Software University @ Facebook facebook.com/SoftwareUniversity Software University @ YouTube youtube.com/SoftwareUniversity Software University Forums forum.softuni.bg
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