Errors I don't understand (overloading)

I get:

Code:

Warning W8066 d.cpp 11: Unreachable code in function main()
Warning W8004 d.cpp 10: 'exp' is assigned a value that is never used in function
 main()
Error E2335 d.cpp 15: Overloaded 'exp' ambiguous in this context in function levup()
Error E2335 d.cpp 16: Overloaded 'exp' ambiguous in this context in function levup()

for:

Code:

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <string>
void levup();
int level=1;
int main()
{
int exp=99;
for(;;){ exp++;cout<<"Your level is: "<<level; levup();}
getch();
return 0;
}
void levup(){
if (exp==100){
exp=0;
level++;
}
return;
}

Could someone tell me what I'm doing wrong?
P.S.:This is a part of my new RPG.

Your for loop goes on for ever, there is no way to get out of it.

In levup(), where does this exp variable come into scope? It is not global and it is not defined in the function.

Why does your void function have a return; in it?

I still get errors for:

Code:

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <string>
void levup();
int exp=0;
int level=1;
int main()
{
while(level<100){ 
exp++;
cout<<"Your level is: "<<level; 
levup();
getch();
}
return 0;
}
void levup(){
if (exp==100){
exp=0;
level++;
}
}

And the errors:

Code:

Error E2356 d.cpp 6: Type mismatch in redeclaration of 'exp(double)'
Error E2063 d.cpp 6: Illegal initialization
Error E2141 d.cpp 6: Declaration syntax error
Error E2335 d.cpp 11: Overloaded 'exp' ambiguous in this context in function mai
n()
Error E2335 d.cpp 19: Overloaded 'exp' ambiguous in this context in function lev
up()
Error E2335 d.cpp 20: Overloaded 'exp' ambiguous in this context in function lev
up()

I am in a hurry but-

Code:

int exp;
exp=0;

shoudl be

Code:

int exp=0;

try this:

Code:

#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <cstring>
using namespace std;

void levup(int &exp, int &level);

int main()
{
	int exp = 0, level = 1;
	
	while(level<100){
		exp++;
		cout<<"Your level is: "<<level;
		levup(exp, level);
		getch();
	}
	
	return 0;
}
void levup(int &exp, int &level){
	if (exp==100){
		exp=0;
		level++;
	}
}

try to avoid using global variables also. this compiles, should do what you want it to.

>>Type mismatch in redeclaration ...
Your name is clashing with another.