C Programming Series: Switch Statement

Introduction

• Instructor: Padma from Programmees
• Topic: Switch statement in C programming
• Objective: Learn to create decision-making programs using the switch statement
• Example project: Calculator using switch statement

Scenario Overview

• Given a number (1-7), print the day of the week:
  • Example: Number 1 = Sunday, Number 2 = Monday
• Challenge with if-else statement:
  • Requires separate conditions for each number
  • Makes code messy and hard to understand

Switch Statement

Syntax

• Starts with switch keyword
• Followed by a variable or expression in parentheses
• Contains multiple cases, each with its own value
• Matching case's body is executed
• If no match, default case body is executed

Example: Days of the Week Program

• Declare variable: int number
• Prompt user for input (number 1-7)
• Use switch to print corresponding day:
  • Case 1: Sunday, Case 2: Monday, ..., Case 7: Saturday
• Use default to handle invalid numbers
• Use break to exit switch after executing a case

Demonstration

• Input examples: 5 (outputs Thursday), 6 (outputs Friday), 9 (outputs Invalid number)
• Importance of break statement:
  • Prevents fall-through execution of subsequent cases

Advanced Usage

• Situations to omit break for multiple case execution:
  • Example: Check if a day is a weekday or weekend
  • Cases 2-6 print "Weekday"
  • Cases 1 & 7 print "Weekend"

Creating a Simple Calculator

• Use switch statement for calculator functionality
• Steps:
  • Declare operator variable
  • Ask user for operator input
  • Ask for two numbers
  • Store result of operation
  • Switch uses operator to perform the correct case operation

Examples

• Addition: Operator +, numbers 8 & 12, result 20
• Multiplication: Operator , numbers 9 & 5, result 45

Programming Task

• Task: Use switch to find month from number input (1-12)
• Example: 1 = January, 2 = February, ..., 12 = December
• Solution available in GitHub repository

Conclusion and Quiz

• Programming quiz provided at end of video
• Engage with content: Comment, Like, Subscribe

Additional Resources

• Mobile app for C programming course with certification
• Free course with built-in compiler
• GitHub repository link for code examples and tasks