Using printf for output in C - Mini Project: Build & Apply

Using printf for output

📖 Scenario: You are learning how to show messages on the screen using the printf function in C. This is like writing a note on a board so others can see it.

🎯 Goal: You will write a simple C program that uses printf to display a greeting message.

📋 What You'll Learn

Create a variable to hold a name

Create a variable to hold an age

Use printf to show a message including the name and age

💡 Why This Matters

🌍 Real World

Displaying messages is a basic need in many programs, like showing user information or status updates.

💼 Career

Knowing how to output text is essential for debugging and user interaction in software development.

1

Create variables for name and age

Create a variable called name of type char[] and set it to "Alice". Create an integer variable called age and set it to 30.

C

#include 

int main() {
    char name[] = "Alice";
    int age = 30;
    // Your code here
    return 0;
}

Need a hint?

Use char name[] = "Alice"; to create the name variable and int age = 30; for the age.

2

Prepare the message format

Create a string variable called message and set it to "Hello, my name is %s and I am %d years old." This will be used as the format for printf.

C

#include 

int main() {
    char name[] = "Alice";
    int age = 30;
    char message[] = "Hello, my name is %s and I am %d years old.";
    // Your code here
    return 0;
}

Need a hint?

Use char message[] = "Hello, my name is %s and I am %d years old."; to create the message format string.

3

Use printf to display the message

Use printf with the message variable and pass name and age as arguments to show the full greeting.

C

#include 

int main() {
    char name[] = "Alice";
    int age = 30;
    char message[] = "Hello, my name is %s and I am %d years old.";
    printf(message, name, age);
    // Your code here
    return 0;
}

Need a hint?

Use printf(message, name, age); to print the message with the variables.

4

Print a new line after the message

Add a printf statement to print a new line character \n after the greeting message so the output looks clean.

C

#include 

int main() {
    char name[] = "Alice";
    int age = 30;
    char message[] = "Hello, my name is %s and I am %d years old.";
    printf(message, name, age);
    printf("\n");
    // Your code here
    return 0;
}

Need a hint?

Use printf("\n"); to add a new line after the message.