Thread: Compile Errors, Please Help

Code:

I using msvs2010 on vistaOS (so i am told i need to use include<stdafx.h> even though it doesnt appear in my stdlib?)
so this is the code teaching me how to use class, in this case Fraction class:

#include <stdafx.h>
#include <stdlib.h>


class Fraction {
private:
	int num, den;
public:
	void set(int n, int d) {num = n; den = d; normalize();}
	int get_num() {return num;}
	int get_den() {return den;}
private:
	void normalize();
	int gcf(int a, int b);
	int lcm(int a, int b);
};

void Fraction::normalize() {
	if (den == 0 || num == 0) {
		num = 0;
		den = 1;
	}
	if (den < 0) {
		num *= -1;
		den *= -1;
	}
	int n = gcf(num, den);
	num /= n;
	den /= n;
}

int Fraction::gcf(int a, int b) {
	if (a % b == 0)
		return abs(b);
	else
		return gcf(b, a % b);
}

int Fraction::lcm(int a, int b) {
	return (a / gcf(a, b)) * b;
}


OK, now here the output results:

1>------ Build started: Project: Fract1, Configuration: Debug Win32 ------
1>Build started 3/10/2011 9:50:21 PM.
1>InitializeBuildStatus:
1>  Touching "Debug\Fract1.unsuccessfulbuild".
1>ClCompile:
1>  All outputs are up-to-date.
1>  All outputs are up-to-date.
1>ManifestResourceCompile:
1>  All outputs are up-to-date.
1>MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
1>C:\Users\Jimmy\Documents\Visual Studio 2010\Projects\Fract1\Debug\Fract1.exe : fatal error LNK1120: 1 unresolved externals
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:00.41
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


I'm pulling my hair out checking to make sure everything is right and it seems to be, why is it not working?  this code is straightoutta the book C++without fear, and the answer code provided with the book.  cant wait to hear your answers :)

I belive that stdafx should not be used like

Code:

# include <stdafx.h>

but

Code:

# include "stdafx.h"

thanks for replying, iidnt thinkt hat was the problem since i am instructed to use <stdafx> specifically in the book, and all the projects up til now (11chptrs) ran fine with that<>. I tried the " " you suggested though and still got the same result output.
it seems to be looking for a main function? cant get it to compile.

Did you write the main function somewhere?

there is no main() specified in the example exercise yet, maybe because im in the beginning of the chapter. but im goign to move ahead and try the next one i get teh smae prob ill post again. thanks again guys for trying...

no i didnt write a main anywhere yet.

Without main(), you will definitely get errors....
Do

Code:

void main(){
Fraction f;
}

that did it...you da man thanks guys!

Don't mention.....
And i am amazed you directly started reading classes?

Don't really matter..... Can use either...