Real-Life Examples of If...Else Statements in C

Discover how the if...else statement in C enables you to manage program flow based on specific conditions. Explore practical examples that illustrate the use of if...else statements in real-life scenarios.

C If...Else Examples

The if...else statement in C allows you to control the flow of your program based on certain conditions. Let's explore some real-life examples where if...else statements can be used.

Example 1: Opening a Door with a Correct Code

In this example, we check if a user enters the correct code to "open" a door.

Example: Door Code Validation


#include <stdio.h>

int main() {
    int doorCode = 1337;

    if (doorCode == 1337) {
        printf("Correct code.\nThe door is now open.\n");
    } else {
        printf("Wrong code.\nThe door remains closed.\n");
    }

    return 0;
}

Output:

Output


Correct code.
The door is now open.

Example 2: Check if a Number is Positive or Negative

This example determines whether a given number is positive, negative, or zero.

Example: Positive or Negative Number


#include <stdio.h>

int main() {
    int myNum = 10; // Is this a positive or negative number?

    if (myNum > 0) {
        printf("The value is a positive number.\n");
    } else if (myNum < 0) {
        printf("The value is a negative number.\n");
    } else {
        printf("The value is 0.\n");
    }

    return 0;
}

Output:

Output


The value is a positive number.

Example 3: Check if Someone is Old Enough to Vote

This example checks if a person is old enough to vote based on their age.

Example: Voting Eligibility


#include <stdio.h>

int main() {
    int myAge = 25;
    int votingAge = 18;

    if (myAge >= votingAge) {
        printf("Old enough to vote!\n");
    } else {
        printf("Not old enough to vote.\n");
    }

    return 0;
}

Output:

Output


Old enough to vote!

Example 4: Check if a Number is Even or Odd

This example checks if a number is even or odd using the modulus operator %.

Example: Even or Odd Number


#include <stdio.h>

int main() {
    int myNum = 5;

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

    return 0;
}

Output:

Output


5 is odd.