Function calling - Mini Project: Build & Apply

Function calling

📖 Scenario: You are creating a simple program to greet a user by name. The greeting message will be generated by a function.

🎯 Goal: Build a C program that defines a function to print a greeting message and then calls that function from main.

📋 What You'll Learn

Define a function called greet that takes no parameters and returns nothing.

Inside greet, print the message Hello, friend!.

Call the greet function from the main function.

💡 Why This Matters

🌍 Real World

Functions help organize code into reusable blocks, making programs easier to read and maintain.

💼 Career

Understanding function calling is essential for any programming job, as it is a basic building block of software development.

1

Create the greet function

Write a function called greet that takes no parameters and prints Hello, friend! using printf.

C

#include 

// Define the greet function here
// Your code here

int main() {
    return 0;
}

Need a hint?

Use void greet() to define the function and printf to print the message.

2

Call the greet function from main

Inside the main function, call the greet function by writing greet(); before return 0;.

C

#include 

void greet() {
    printf("Hello, friend!\n");
}

int main() {
    // Call greet function here
    // Your code here
    return 0;
}

Need a hint?

Simply write greet(); inside main before return 0;.

3

Add a function prototype for greet

Add a function prototype for greet above main by writing void greet();.

C

#include 

// Add function prototype for greet here
// Your code here

void greet() {
    printf("Hello, friend!\n");
}

int main() {
    greet();
    return 0;
}

Need a hint?

Write the prototype void greet(); before the function definitions.

4

Run the program and print the output

Run the program and print the output by writing printf output to the console. The program should print Hello, friend!.

C

#include 

void greet();

void greet() {
    printf("Hello, friend!\n");
}

int main() {
    greet();
    // Output is printed by greet function
    // Your code here
    return 0;
}

Need a hint?

The greet function already prints the message. Just run the program to see the output.