C program to calculate the area of square with and without using function

In this program, we will learn about C program to calculate the area of square using function and without using the function.

C program to calculate the area of square

For better understanding of the program, you should know about following C programming topic :

• c programming functions

The formula to calculate the area of a square is:

Area = length * length

Area of square without using function

#include <stdio.h>

int main()
{
   int square_side, area;

   printf("Enter the side of square: ");
   scanf("%d", &square_side);
   //calculation of the area
   area = square_side * square_side;

   printf("Area of the square: %d", area);
   return 0;
}

Output:

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Area of square using function

/* program to calculate the area of square */
#include <stdio.h>
void area(); //function prototype

int main() //function main begins program execution
{
   area(); //function call
   return 0;
}
   // end main
void area() //called function
{
    int square_area, square_side;

    printf("Enter the side of square:");
    scanf("%d",&square_side);
    square_area = square_side * square_side;
    printf("Area of Square = %d",square_area);
} //end function area

Output: