Java If-Else Condition Lecture

Problem Statement

• Write a program that asks the user to enter two integer values.
• The task is to print the quadrant of the coordinate system the values fall into.

Key Points

1. Understanding Quadrants: Visualize the question using a coordinate system.

   • Quadrant I: x > 0 and y > 0
   • Quadrant II: x < 0 and y > 0
   • Quadrant III: x < 0 and y < 0
   • Quadrant IV: x > 0 and y < 0
   • Origin: x = 0 and y = 0

2. User Input

   • Use Scanner to get input from the user.
   • Ask for two integer values (x and y).

   import java.util.Scanner;
   Scanner sc = new Scanner(System.in);
   System.out.print("Enter the value of x: ");
   int x = sc.nextInt();
   System.out.print("Enter the value of y: ");
   int y = sc.nextInt();
   

3. Conditional Logic

   • Handle the condition where both x and y are zero first.
   • Use if-else statements to determine and print the correct quadrant based on x and y values.

   if (x == 0 && y == 0) {
       System.out.println("Origin");
   } else if (x > 0 && y > 0) {
       System.out.println("Quadrant 1");
   } else if (x < 0 && y > 0) {
       System.out.println("Quadrant 2");
   } else if (x < 0 && y < 0) {
       System.out.println("Quadrant 3");
   } else if (x > 0 && y < 0) {
       System.out.println("Quadrant 4");
   }
   

4. Compilation and Testing

   • Compile the code and run it.
   • Enter different values for x and y to test if the correct quadrant is printed.

Example

• If x = 8 and y = -8, the program should output Quadrant 4.

Notes

• Ensure the Scanner is imported correctly.
• Handle all edge cases, especially when x or y is zero.
• Validate input for robustness in a real-world scenario.