C program to find area of rectangle

In this post, you will learn how to write programs using the C programming language to find the area of a rectangle.

The area of a rectangle is the region covered by the rectangle in a two-dimensional plane. A rectangle is a two-dimensional shape that has four sides and four vertices. The area of a rectangle is the number of unit squares that can fit into a rectangle. If we know the width and height of a rectangle, we can easily calculate the area of a rectangle using the following formula.

Area = Width * Height

Simple C program to calculate area of rectangle

In the given C program, we have given the width and height of a rectangle. We calculate the area of the rectangle by multiplying the width and height of the rectangle.

#include <stdio.h>  
int main()  
{  
    int width=45;  
    int height=20;  
    int area=width*height;  
    printf("Area of the rectangle=%d",area);  
}  

Area of the rectangle=900

C program to calculate area of rectangle using user input

The given C program allows a user to enter the width and height of a rectangle. Next, we calculate the area as per the formula: Area = width * height.

// C Program to find Area of a Rectangle

#include <stdio.h>

int main()
{
    int length, width, area;

    //Input length and width of rectangle

    printf("Please enter length of rectangle: ");
    scanf("%d", &length);
    printf("Please enter width of rectangle: ");
    scanf("%d", &width);

    /* Calculate area of rectangle */
    area = length * width;

    /* Print area of rectangle */
    printf("Area of rectangle = %d", area);

    return 0;
}

Please enter length of rectangle: 45
Please enter width of rectangle: 2
Area of rectangle = 90

Please enter length of rectangle: 23
Please enter width of rectangle: 53
Area of rectangle = 1219

C program to find area of rectangle using user-defined function

In the given C program, we have created a user-defined function areaRectangle() to calculate the area of a rectangle.

// C Program to find Area of a Rectangle using function

#include <stdio.h>

int areaRectangle(int, int);

int main()
{
    int length, width, area;

    //Input length and width of rectangle
    printf("Enter the length : ");
    scanf("%d", &length);

    printf("Enter the width : ");
    scanf("%d", &width);

    /* Calculate area of rectangle */
    area = areaRectangle(length, width);

    /* Print area of rectangle */
    printf("The area of the rectangle : %d", area);

    return 0;
}

int areaRectangle(int l, int w)
{
    return l * w;
}

Enter the length : 92
Enter the width : 21
The area of the rectangle : 1932

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