Function parameters - Mini Project: Build & Apply

Function parameters

📖 Scenario: You are creating a simple calculator program that adds two numbers. You will use a function that takes two numbers as inputs and returns their sum.

🎯 Goal: Build a C program that defines a function with parameters to add two integers and prints the result.

📋 What You'll Learn

Create a function called add that takes two int parameters named a and b.

The add function should return the sum of a and b.

In main, call the add function with the numbers 5 and 7.

Print the result returned by add.

💡 Why This Matters

🌍 Real World

Functions with parameters are used everywhere in programming to reuse code and perform tasks with different inputs, like calculators, games, and apps.

💼 Career

Understanding how to write and use functions with parameters is a fundamental skill for any software developer or programmer.

1

Create the add function with parameters

Write a function called add that takes two int parameters named a and b. The function should return an int. Do not write the function body yet.

C

int add(int a, int b);

// Your code here

Need a hint?

Start by writing the function header: int add(int a, int b) and add a placeholder return.

2

Implement the add function body

Inside the add function, write code to return the sum of a and b.

C

int add(int a, int b) {
    // Your code here
}

int main() {
    return 0;
}

Need a hint?

Use the return statement to send back the sum of a and b.

3

Call the add function in main

In the main function, call the add function with the arguments 5 and 7. Store the result in an int variable named result.

C

int add(int a, int b) {
    return a + b;
}

int main() {
    // Your code here
}

Need a hint?

Use int result = add(5, 7); to call the function and save the answer.

4

Print the result

Add a printf statement in main to print the value of result. Use "%d\n" as the format string.

C

int add(int a, int b) {
    return a + b;
}

int main() {
    int result = add(5, 7);
    // Your code here
    return 0;
}

Need a hint?

Use printf("%d\n", result); to show the sum on the screen.