C program to find perimeter of a rectangle

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C program to find perimeter of a rectangle

Write a C program to input length and width of a rectangle and calculate perimeter of the rectangle. How to find perimeter of a rectangle in C programming. Logic to find the perimeter of a rectangle if length and width are given in C programming.

Required knowledge

Data Types in c, Input/Output in C, C Operators, Variables

Perimeter of rectangle

Perimeter of rectangle is given by the below formula

Perimeter of rectangle

Where l is length and w is the width of rectangle.

Logic to find perimeter of a rectangle

Below is the step by step descriptive logic to find perimeter of a rectangle

Input length and width of the rectangle using scanf() function. Store it in two variables say length and width.

Calculate perimeter using formula for perimeter of rectangle perimeter = 2 * (length + width).

Print the value of perimeter.

Program to find perimeter of rectangle

/**
 * C program to find perimeter of rectangle
 */

#include <stdio.h>

int main()
{
    float length, width, perimeter;

    /*
     * Input length and width of rectangle from user
     */
    printf("Enter length of the rectangle: ");
    scanf("%f", &length);
    printf("Enter width of the rectangle: ");
    scanf("%f", &width);

    /* Calculate perimeter of rectangle */
    perimeter = 2 * (length + width);

    /* Print perimeter of rectangle */
    printf("Perimeter of rectangle = %f units ", perimeter);

    return 0;
}

Note: Never forget to prioritize the order of operations using a pair of braces ( ). Since, statements perimeter = 2 * length + width and perimeter = 2 * (length + width) will generate different results.

In addition, never write statement like 2 * (length + width) as 2(length + width). It will generate a compilation error.

Output:

Enter length of the rectangle: 5
Enter width of the rectangle: 10
Perimeter of rectangle = 30.000000

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