Microsoft Visual C++ 6.0 problem...

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I just got MVC++ and i am haveing probs with a simple program (win32 console project) it involves a basic class 3-4 functions (plus main) one typedef and a few other things. My problem is this, when i compile it i get no errors, but when i run the program it does not run my functions, only void main(). I hope this is not to big to fit.. but here is the code. Please read and help a newbie

#include

typedef short unsigned int USHORT;

void build();

void total();

void exitpro();

int exit = 0;

class computer

{

private:

USHORT Monitor; //1

USHORT Cpu; //2

USHORT Ram; //3

USHORT Hd; //4

USHORT Fd; //5

USHORT Case; //6

USHORT Cd; //7

USHORT Mobo; //8

USHORT Sc; //9

USHORT Md; //10

USHORT Vc; //11

USHORT Cables; //12

USHORT Spkr; //13

public:

void Change_Class(int, int);

};

void computer::Change_Class(int com, int cost)

{

if (com == 1)

Monitor = cost;

if (com == 2)

Cpu = cost;

if (com == 3)

Ram = cost;

if (com == 4)

Hd = cost;

if (com == 5)

Fd = cost;

if (com == 6)

Case = cost;

if (com == 7)

Cd = cost;

if (com == 8)

Mobo = cost;

if (com == 9)

Sc = cost;

if (com == 3)

Md = cost;

if (com == 3)

Vc = cost;

if (com == 3)

Cables = cost;

if (com == 3)

Spkr = cost;

else

{

cout << "Error#3:INVALID INT AT 'void computer::Change_Class(int com, int cost)'
";<br>
exitpro();

}

}

void main()

{

USHORT Menu;

do

{

cout << "Welcome to Price machine version 2.0.
";<br>
cout << "This program uses classes in place of 300 int's
";<br>
cout << "Main menu:
1=Build new computer
2=Show total
3=Exit
";<br>
cout << "Enter a number: ";<br>
cin >> Menu;

if(Menu == 1)

void build();

if(Menu == 2)

void total();

if(Menu == 3)

exitpro();

else

{

cout << "Error#1
";<br>
void exitpro();

}

}

while(exitpro == 0);

}

void build()

{

computer MyComp;

int mon, cpu, ram, cdd, cse, mdm, snd, vdc, spk, fdd, hdd, mbo, cbl;

cout << "Enter your monitor
";<br>
cout << "1=mon1
2=mon2";<br>
cin >> mon;

if(mon == 1)

MyComp.Change_Class(1, 100);

if(mon == 2)

MyComp.Change_Class(1, 200);

else

{

void exitpro();

}

cout << "Enter your CPU
";<br>
cout << "1=cpu1
2=cpu2";<br>
cin >> cpu;

if(cpu == 1)

MyComp.Change_Class(2, 300);

if(mon == 2)

MyComp.Change_Class(2, 400);

else

{

void exitpro();

}

}

void exitpro()

{

exit = 1;

}