// en C++

#include <iostream>
#include <math.h>

using namespace std;

inline double ABS(double x)
{
 return (x>0 ? x : -x);
}

int main(void)
{
 double x = -9.0;
 double y = sqrt(ABS(x));

 cout << "sqrt(ABS(" << x << "))=" << y << endl;

 return 0;
}