Write code in c++ for calculating square root

#include <iostream>
#include <cmath> // Built-in math library

int main() {
    double number, result;
    
    std::cout << "Enter a number: ";
    // Takes live input below
    
    if (number < 0) {
        std::cout << "Error: Negative input!";
    } else {
        result = std::sqrt(number);
        std::cout << "Square root = " << result;
    }
    
    return 0;
}