Program doesn't calculate

[Marcial]

This is part of a code I’m working in, and for some reason it doesn’t work. It doesn’t matter the values I enter for h and min, it’s returning GT = -off. If I put off = -2.0, it returns GT=2.000000. Do you know what’s the problem?

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

using namespace std;

int main () {
   int h, min;
   double off, GT;
   cout << "Enter the hour at your place: \n";
   cin >> h;
   cout << "Now enter the minutes: \n";
   cin >> min;
   cout << "Enter your local offset to Greenwich Time: \n";
   cin >> off;
   GT=(h/24)+(min/60)-off;
   cout << "Greenwich Time in decimals is " << GT << "\n";
   system ("PAUSE");
        return 0;

}

[long double main]

On line 16, you're doing integer division:
GT=(h/24)+(min/60)-off;
Since h and min are integers, h/24 and min/60 will both be integers as well.

The easiest way to fix that is to make one of them a floating-point value:
GT=(h/24.0)+(min/60.0)-off;

Also, you don't need to #include <stdio.h> (probably should've been #include <cstdio> anyways since it's C++) in your code (since you don't use any functions in that header).

[Dy7SLyTq]

what are you using as input?

edit: nevermind

[Marcial]

long double main, thanks a lot for your help. I've learned C in college and I didn't know that C++ would be so different.

[Aceix]

long double main wrote:

since you don't use any functions in that header

system(const char*) ?

Aceix.

[long double main]

system is in <stdlib.h>.

[kevinkjt2000]

system(const char*) is part of cstdlib or stdlib.h
http://www.cplusplus.com/reference/cstdlib/system/
So it is true that the OP does not necessarily need cstdio or stdio.h since iostream is in use.

[Aceix]

Oops didn't see that clearly. Sorry my fault.

Aceix.