C if-else

Used for conditional execution of code.
A block of code is given and execueted to check if a given condition is true or flase. It goes for another block if the condition is false. Syntax

if (condition) {

// Code to be executed if the condition is true

} else {

// Code to be executed if the condition is false

}

Example

#include <stdio.h>

int main() {
    int num = 10;

    // Check if num is even or odd
    if (num % 2 == 0) {
        printf("%d is even.\n", num);
    } else {
        printf("%d is odd.\n", num);
    }

    return 0;
}

Run

The above example checks the condition if num % 2 == 0
if the condition is false then it goes to the else block.

C else if

Multiple conditions are checked using else if.
Syntax

if (condition1) {

// Code to be executed if the condition1 is true

} else if(condition2) {

// Code to be executed if the condition1 is false and condition2 is true

} else {

// Code to be executed if all conditions are false

}

Example

#include <stdio.h>

int main() {
    int score = 75;

    // Grading based on the score
    if (score >= 90) {
        printf("Grade A\n");
    } else if (score >= 80) {
        printf("Grade B\n");
    } else if (score >= 70) {
        printf("Grade C\n");
    } else {
        printf("Grade F\n");
    }

    return 0;
}

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C if-else

Example

C else if

Example

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