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:

- Using Standard Method
- Using Pow() Function
- Using Function

So, without further ado, letâ€™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.

**Also Read:**