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.

**Example**

**Input**

Input length: 5 Input width: 10

**Output**

Perimeter of rectangle = 30 units

## Required knowledge

Fundamentals of C, Data types, Taking user input in C

## Perimeter of rectangle

Perimeter of rectangle is given by the below formula

Where *l* is the 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

- Read length and width of the rectangle using scanf() function. Store these in two variables say length and width.
- Apply the 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; /* * Reads 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); /* Calculates perimeter of rectangle */ perimeter = 2 * (length + width); /* Prints 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 ( ). As both the statements perimeter = 2 * length + width and perimeter = 2 * (length + width) generates different results. Also never ever write the statements like 2 * (length + width) as 2(length + width). It will generate a compiler error.

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

Happy coding ;)

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