C++ Program - Square Root of a Number

If a number is multiplied by itself (n*n), the final number will be the square of that number and finding the square root of a number is inverse operation of squaring the number. If x is the square root of y, it can be expressed as below:

Alternatively, it can also be expressed as:

x² = y

Method 1: Using sqrt() function of C++ <cmath> header file

The sqrt() function of C++ <cmath> header file can be used to return square root of a number.

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

int main() {
  double x = 16;
  double y = 25;

  double x1 = sqrt(x);
  double y1 = sqrt(y);
  cout<<"Square root of "<<x<<" is "<<x1<<"\n";
  cout<<"Square root of "<<y<<" is "<<y1<<"\n";
  return 0;
}

The above code will give the following output:

Square root of 16.0 is 4.0
Square root of 25.0 is 5.0

Method 2: Using pow() function of C++ <cmath> header file

The pow() function of C++ <cmath> header file can also be used to calculate square root of a number.

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

int main() {
  double x = 16;
  double y = 25;

  double x1 = pow(x, 0.5);
  double y1 = pow(y, 0.5);
  cout<<"Square root of "<<x<<" is "<<x1<<"\n";
  cout<<"Square root of "<<y<<" is "<<y1<<"\n";
  return 0;
}

The above code will give the following output:

Square root of 16.0 is 4.0
Square root of 25.0 is 5.0