C Program To Find Area And Perimeter of Rectangle

Here, we will find the area and perimeter of rectangle using a C Program as follows:

Example: 

Input:

l = 10 
b = 10 

Output: 

area = 100 
perimeter = 40 

Explanation: 

The formula for the area of a rectangle is 

Area = length*breadth => l*b 

The formula for the perimeter of a rectangle is 

Perimeter = 2*(length + breadth) => 2*(l+b) 

Method 1: 

C

// C program to demonstrate the
// area and perimeter of rectangle
#include <stdio.h>

int main()
{

    int l = 10, b = 10;
    printf("Area of rectangle is : %d", l * b);
    printf("\nPerimeter of rectangle is : %d", 2 * (l + b));
    return 0;
}

Output

Area of rectangle is : 100
Perimeter of rectangle is : 40

Method 2: 

C

// C program to demonstrate the
// area and perimeter of rectangle
#include <stdio.h>

int main()
{

    int l = 10, b = 10;
    int A, P;
    A = l * b;
    P = 2 * (l + b);
    printf("Area of rectangle is : %d", A);
    printf("\nPerimeter of rectangle is : %d", P);
    return 0;
}

Output

Area of rectangle is : 100
Perimeter of rectangle is : 40

Method 3: Using functions 

C

// C program to demonstrate the
// area and perimeter of rectangle
// using function
#include <stdio.h>

int area(int a, int b)
{
    int A;
    A = a * b;
    return A;
}
int perimeter(int a, int b)
{
    int P;
    P = 2 * (a + b);
    return P;
}

int main()
{

    int l = 10, b = 10;
    printf("Area of rectangle is : %d", area(l, b));
    printf("\nPerimeter of rectangle is : %d",
           perimeter(l, b));
    return 0;
}

Output

Area of rectangle is : 100
Perimeter of rectangle is : 40