The provided C++ code is a simple program that calculates the square root of a user-provided number. It begins by including the necessary libraries, `iostream`

for input/output operations and `cmath`

for mathematical operations.

## Code

```
#include <iostream>
#include <cmath>
using namespace std;
// Main function of the program
int main() {
// Declare a float variable to store the user's input
float inputNumber;
// Prompt the user to enter a number
cout << "Enter a number to calculate its square root: ";
// Store the user's input in the variable
cin >> inputNumber;
// Check if the input number is non-negative
if (inputNumber >= 0.0) {
// Calculate the square root of the input number
float squareRoot = sqrt(inputNumber);
// Print the input number
cout << "Input number: " << inputNumber << "\n";
// Print the square root of the input number
cout << "Square root: " << squareRoot << "\n";
}
}
```

## Explanation

The provided C++ code is a simple program that calculates the square root of a user-provided number. It begins by including the necessary libraries, `iostream`

for input/output operations and `cmath`

for mathematical operations.

```
#include <iostream>
#include <cmath>
using namespace std;
```

The main function of the program starts with the declaration of a float variable `inputNumber`

which is used to store the user’s input.

`float inputNumber;`

The program then prompts the user to enter a number using `cout`

and stores the user’s input in the `inputNumber`

variable using `cin`

.

```
cout << "Enter a number to calculate its square root: ";
cin >> inputNumber;
```

The program checks if the input number is non-negative using an `if`

statement. This is important because the square root of a negative number is not a real number and would result in an error.

`if (inputNumber >= 0.0) {`

Inside the `if`

statement, the program calculates the square root of the input number using the `sqrt`

function from the `cmath`

library and stores the result in the `squareRoot`

variable.

`float squareRoot = sqrt(inputNumber);`

Finally, the program prints the input number and its square root using `cout`

.

```
cout << "Input number: " << inputNumber << "\n";
cout << "Square root: " << squareRoot << "\n";
```

This code is a simple demonstration of user input, conditional statements, and mathematical operations in C++.

## Output

```
Enter a number to calculate its square root: 15
Input number: 15
Square root: 3.87298
Process finished with exit code 0
```