fabs not working...

[GeckoLink]

hello again! Today I attempted to write a program using the fabs function but it said that fabs was undeclared.... please help! Thanks in advance!

the code in question:

#include <iostream>
#include <stdlib.h>

using namespace std;

int main (int argc, char *argv[])
	{
		double start;
		double finnish;
		start = -253.895;
		finnish = fabs(start);
		cout << finnish;

		return 0;
}

[quirkyusername]

fabs is in the cmath library so you must #include <cmath> before main.

[GeckoLink]

thanks that really helped!