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

In this example, you will learn about C++ program to calculate the area of square with and without using a function.

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

• C++ function

The formula to calculate the area of a square is:

Area = length * length

Example: C++ program to calculate the area of square

/* program to calculate the area of square */
#include <iostream>
using namespace std;

int main() //function main begins program execution
{
   int square_area, square_side;

   cout << "Enter the side of square:";
   cin >> square_side;

   square_area = square_side * square_side;

   cout << "Area of Square: " << square_area << endl;
   return 0;
} // end main

Output

Example: C++ program to calculate the area of square using function

/* program to calculate the area of square using function */
#include <iostream>
using namespace std;

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;

   cout << "Enter the side of square:";
   cin >> square_side;

   square_area = square_side * square_side;

   cout << "Area of Square: " << square_area << endl;
} //end function area

Output