C Program to calculate area of rectangle

In this example, we will write a C program to calculate area of rectangle based on user input. For example, if user enters width as 4 and height as 2 then program should print 8 as area of rectangle.

Area of rectangle = width * height

C Program to calculate area of rectangle based on user input

#include <stdio.h>

int main() {
    float width, height, area;

    // Prompts the user to enter width of the rectangle
    printf("Enter width of the rectangle: ");
    scanf("%f", &width);

    // Prompts the user to enter height of the rectangle
    printf("Enter height of the rectangle: ");
    scanf("%f", &height);

    // Calculate the area of the rectangle
    area = width * height;

    // Print the area of rectangle
    printf("Area of the rectangle is: %.2f\n", area);

    return 0;
}

Output:

Enter width of the rectangle: 5.5
Enter height of the rectangle: 3.2
Area of the rectangle is: 17.60

Explanation:

1. Include header file: The stdio.h header file is included to use the printf and scanf functions for input and output.
2. Declare variables: In this program, we have three variables: width, height and area. These variables store the width, height, and area of the rectangle, respectively.
3. Input: It prompts the user to enter the width and height of the rectangle using printf. User entered values are read and stored in respective variables using scanf.
4. Calculate the area: Area of the rectangle is calculated using the formula width * height.
5. Print the result: Finally, the area is printed using printf.