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× C++ Standard Library C++ STL Library


The C++ cmath sqrt() function is used to return the square root of the given number.

Syntax

double sqrt(double x);
float sqrt(float x);
long double sqrt(long double x);
double sqrt(double x);
float sqrt(float x);
long double sqrt(long double x);
//additional overloads for integral types
double sqrt(T x);                    

Parameters

x Specify a positive number.

Return Value

Returns the square root of the specified number.
If the x is negative, domain error occurs.

Example:

In the below example, sqrt() function is used to find out the square root of the given number.

#include <iostream>
#include <cmath>

using namespace std;
 
int main (){
  cout<<sqrt(25)<<"\n";
  cout<<sqrt(30)<<"\n";
  cout<<sqrt(35.5)<<"\n";
  cout<<sqrt(100)<<"\n";  
  return 0;
}

The output of the above code will be:

5
5.47723
5.95819
10

❮ C++ <cmath> Library