Calculate square root of an integer with cmath library in C++

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