Macro with arguments - Mini Project: Build & Apply

Macro with arguments

📖 Scenario: You are writing a small C program to calculate the area of rectangles quickly using macros.

🎯 Goal: Build a macro that takes two arguments (width and height) and calculates the area of a rectangle.

📋 What You'll Learn

Create a macro named AREA that takes two arguments: width and height.

Use the macro to calculate the area of rectangles with given dimensions.

Print the calculated area.

💡 Why This Matters

🌍 Real World

Macros with arguments are used in C programming to write reusable code snippets that can perform calculations or operations quickly without function call overhead.

💼 Career

Understanding macros helps in embedded systems programming, performance-critical applications, and working with legacy C codebases.

1

Create width and height variables

Create two integer variables called width and height and set them to 5 and 10 respectively.

C

#include 

int main() {
    // Create int variables width and height with values 5 and 10
    // Your code here
    return 0;
}

Need a hint?

Use int width = 5; and int height = 10; inside main().

2

Define the AREA macro

Define a macro named AREA that takes two arguments width and height and returns their product. Place the macro definition above main().

C

#include 

// Define AREA macro here
// Your code here

int main() {
    int width = 5;
    int height = 10;
    return 0;
}

Need a hint?

Use #define AREA(width, height) ((width) * (height)) to create the macro.

3

Calculate area using the AREA macro

Create an integer variable called area and set it to the result of AREA(width, height).

C

#include 

#define AREA(width, height) ((width) * (height))

int main() {
    int width = 5;
    int height = 10;
    // Calculate area using AREA macro
    // Your code here
    return 0;
}

Need a hint?

Use int area = AREA(width, height); inside main().

4

Print the calculated area

Use printf to print the text "Area: " followed by the value of area and a newline.

C

#include 

#define AREA(width, height) ((width) * (height))

int main() {
    int width = 5;
    int height = 10;
    int area = AREA(width, height);
    // Print the area
    // Your code here
    return 0;
}

Need a hint?

Use printf("Area: %d\n", area); to display the result.