C program to find perimeter of a rectangle

Write a C program to input length and width of a rectangle from user and calculate perimeter of the rectangle. How to find perimeter of a rectangle if length and breadth of a rectangle are given using C programming. 

Example: 
Input length: 5 
Input Width: 5 
Perimeter of rectangle = 20 units

Required knowledge:

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

Perimeter of rectangle:

Perimeter of a rectangle can be expressed using below formula: 
 
Where l is the length and w is the width of rectangle. 

Program:

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/**  * C program to find perimeter of a rectangle  */ #include <stdio.h> void 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("\nPerimeter of rectangle = %f units ", perimeter); }

Output

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Enter length of the rectangle: 5
Enter width of the rectangle: 5

Perimeter of rectangle = 20.000000

Enjoy it...............