how to find square root in c++ code example

Example 1: sqrt in c++

#include <cmath>
sqrt(x);

Example 2: square root c++

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

/*
square root of a number
*/

int main(){
float num, raiz;
printf("enter a number: \t");
scanf("%f",&num);
raiz = sqrt(num);
printf("The square root of %f is: %f.\n", num, raiz);
system("pause");
return 0;    
}

Example 3: sqrt() function in c++

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

int main()
{
	double x = 10.25, result;
	result = sqrt(x);
	cout << "Square root of " << x << " is " << result << endl;

	return 0;
}