C++ Program to Calculate Square of a Number

In this post, we will learn how to calculate the square of a number using C++ Programming language.

The square of a number is the product of the number with the number itself. For example: the square of 6 is 6 x 6 = 36.

We will calculate the square of a number using the following approaches:

  1. Using Standard Method
  2. Using Pow() Function
  3. Using Function

So, without further ado, let’s begin this post.

C++ Program to Calculate Square of a Number

// C++ Program to Calculate Square of a Number
#include <iostream>
using namespace std;

int main(){
    int n, square;
    
    // Asking for input
    cout << "Enter a number: ";
    cin >> n;
    
    // Calculating square
    square = n * n;
    
    // Displaying output
    cout << "Square of " << n << " is: " << square;
    
    return 0;
} 

Output

Enter a number: 25
Square of 25 is: 625

How Does This Program Work ?

    int n, square;

In this program, we have declared two integer data type variables named n and square.

    // Asking for input
    cout << "Enter a number: ";
    cin >> n;

The user is asked to enter a number. This number gets stored in the ‘n’ named variable.

    // Calculating square
    square = n * n;

Square is calculated by multiplying the same number by itself.

    // Displaying output
    cout << "Square of " << n << " is: " << square;

The square of the entered number is displayed on the screen using the cout statement.

C++ Program to Calculate Square of a Number Using Pow() Function

// C++ Program to Calculate Square of a Number Using Pow() Function
#include <iostream>
#include <cmath>
using namespace std;

int main(){
    int n, square;
    
    // Asking for input
    cout << "Enter a number: ";
    cin >> n;
    
    // Calculating square
    square = pow(n, 2);
    
    // Displaying output
    cout << "Square of " << n << " is: " << square;
    
    return 0;
} 

Output

Enter a number: 9
Square of 9 is: 81

C++ Program to Calculate Square of a Number Using Function

// C++ Program to Calculate Square of a Number Using Function
#include <iostream>
using namespace std;

int calSquare(int x){
    return x * x;
}

int main(){
    int n, square;
    
    // Asking for input
    cout << "Enter an integer: ";
    cin >> n;
    
    // Calling out the custom function
    square = calSquare(n);
    
    // Displaying output
    cout << "The square of " << n << " is: " << square;
    return 0;
}

Output

Enter an integer: 21
The square of 21 is: 441

Conclusion

I hope after going through this post, you understand how to calculate the square of a number using C++ Programming language.

If you have any doubt regarding the program, then contact us in the comment section. We will be delighted to solve your doubts.

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