🔍 if Condition in C Programming
📘 Short Explanation:
In C, the if statement is used to make decisions. It checks a condition—if it's true, the code inside runs. Otherwise, it’s skipped.
It helps control the program’s flow based on logic and input.
✅ Basic Syntax
if (condition) {
// code to execute if condition is true
}
🧪 Example: Simple if Statement
#include <stdio.h>
int main() {
int age = 20;
if (age >= 18) {
printf("You are eligible to vote.\n");
}
return 0;
}
🧠 Output:
You are eligible to vote.
🔁 if-else Syntax
if (condition) {
// runs if true
} else {
// runs if false
}
📋 Example:
int number = 5;
if (number % 2 == 0) {
printf("Even number\n");
} else {
printf("Odd number\n");
}
🔗 if-else if-else Ladder
if (condition1) {
// block 1
} else if (condition2) {
// block 2
} else {
// default block
}
📋 Example:
int score = 85;
if (score >= 90) {
printf("Grade A\n");
} else if (score >= 80) {
printf("Grade B\n");
} else {
printf("Grade C\n");
}
⚠️ Tips to Remember
- Use
==for comparison, not=. - The condition must return true (non-zero) or false (zero).
- You can use logical operators:
&&(AND),||(OR),!(NOT).
📌 Summary
The if statement is the foundation of decision-making in C. It allows your program to respond to conditions, making it flexible and interactive. With if, else, and else if, you can cover all logic scenarios effectively.