What will be the output of the following C++ code?

#include<iostream>
#include "math.h"
using namespace std;
double MySqrt(double d)
{
    if (d < 0.0)
    throw "Cannot take sqrt of negative number";     
    return sqrt(d);
}
int main()
{
    double d = 5;
    cout << MySqrt(d) << endl;
}