If–else statement in C - Mini Project: Build & Apply

If-else statement

📖 Scenario: You are creating a simple program to check if a person is old enough to vote. Voting age is 18 years or older.

🎯 Goal: Build a program that uses an if-else statement to decide if a person can vote based on their age.

📋 What You'll Learn

Create an integer variable called age with the value 20

Create an integer variable called voting_age and set it to 18

Use an if-else statement to check if age is greater than or equal to voting_age

Print "You are eligible to vote." if the condition is true

Print "You are not eligible to vote." if the condition is false

💡 Why This Matters

🌍 Real World

Checking age eligibility is common in many real-life situations like voting, driving, or drinking alcohol.

💼 Career

Understanding if-else statements is essential for any programming job because it helps programs make decisions.

1

Create the age variable

Create an integer variable called age and set it to 20.

C

// Your code here

Need a hint?

Use int age = 20; inside the main function.

2

Add the voting age variable

Create an integer variable called voting_age and set it to 18.

C

#include 

int main() {
    int age = 20;
    // Your code here
    return 0;
}

Need a hint?

Declare int voting_age = 18; after age.

3

Write the if-else statement

Use an if-else statement to check if age is greater than or equal to voting_age. Inside the if, write a comment // Eligible. Inside the else, write a comment // Not eligible.

C

#include 

int main() {
    int age = 20;
    int voting_age = 18;
    // Use if-else to check eligibility
    // Your code here
    return 0;
}

Need a hint?

Use if (age >= voting_age) {} and else {} blocks with comments inside.

4

Print the eligibility message

Inside the if block, write printf("You are eligible to vote.\n");. Inside the else block, write printf("You are not eligible to vote.\n");. Then run the program to see the output.

C

#include 

int main() {
    int age = 20;
    int voting_age = 18;
    if (age >= voting_age) {
        // Print eligible message
        // Your code here
    } else {
        // Print not eligible message
        // Your code here
    }
    return 0;
}

Need a hint?

Use printf inside each block to show the correct message.