math functions

[kjb]

hey guys

i just made a very simple if else program in which if i use cos or sin, or ne trig functin it comes false even tho its true! i'll paste the program below

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


using namespace std;

void main ()

{

if (cos(.52)==cos(.52))
cout << &quot; The Statement is true &quot;;
else
cout << &quot; The statement is false&quot;;







return ;
}

can some1 plz inform me of what 2 do ??

thnx

 

[chipperMDW]

You should never compare floating point numbers for equality, since they aren't represented exactly in memory. you should instead compare within some reasonable range.