C Exercises: Calculate the perimeter of a rectangle

Last update on March 18 2025 13:36:38 (UTC/GMT +8 hours)

3. Rectangle Perimeter Calculation

Write a C program that prints the perimeter of a rectangle using its height and width as inputs.

Pictorial Presentation:

C Input Output: Calculate the perimeter of a rectangle

Sample Solution:

C Code:

#include <stdio.h>     // Include the standard input/output header file.
int main() {
    float rec_width;         /* Declare variable 'rec_width' to store the width of the rectangle */
    float rec_height;        /* Declare variable 'rec_height' to store the height of the rectangle */
    float rec_perimeter;     /* Declare variable 'rec_perimeter' to store the perimeter (to be computed) */

    // Prompt the user to input the height of the rectangle.
    printf("Input the height of the Rectangle : ");
    scanf("%f", &rec_height);  // Read the value of 'rec_height' from the user.

    // Prompt the user to input the width of the rectangle.
    printf("Input the width of the Rectangle : ");
    scanf("%f", &rec_width);  // Read the value of 'rec_width' from the user.

    // Calculate the perimeter of the rectangle using the formula: perimeter = 2 * ( width + height )
    rec_perimeter = 2.0 * (rec_height + rec_width);

    // Print the calculated perimeter of the rectangle.
    printf("Perimeter of the Rectangle is : %f\n", rec_perimeter);

    return 0;  // Indicate successful program execution.
}

Sample Output:

Input the height of the Rectangle : 5                                                                         
Input the width of the Rectangle : 7                                                                          
Perimeter of the Rectangle is : 24.000000

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to calculate the perimeter of a rectangle and then compute the difference between its perimeter and area.
Write a C program to compute the perimeter of a rectangle with height and width provided as command-line arguments.
Write a C program to calculate the perimeter of a rectangle and ensure that both height and width inputs are positive numbers.
Write a C program to read dimensions for multiple rectangles from a file and output the largest perimeter.

C Programming Code Editor:

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