sizeof operand and undeclared identifier errors

[GhqjLyTq]

I'm getting these errors when I try to compile my program:

(7): error C2065: 'percent' : undeclared identifier
(7): error C2065: 'percent' : undeclared identifier
(18): error C2065: 'percent' : undeclared identifier
(18): error C2070: ''unknown-type'': illegal sizeof operand
(19): error C2065: 'percent' : undeclared identifier
(20): error C2065: 'percent' : undeclared identifier
(22): error C2065: 'percent' : undeclared identifier
(27): warning C4551: function call missing argument list

Here's my source code:

#include <iostream>
#include <Windows.h>
using namespace std;
int main (int argv, int argc)
{
	if(argv = NULL) {int percent = 100;} else {int percent = argv;}; // set the percent to 100 or an argument
	if(percent = argv); else {cout << "Enter the speed as a %: "; cin >> percent;}
	HWND hWnd = FindWindow(NULL, "World of Warcraft"); // get the window handle
	if(hWnd == 0) {
		cout << "\nError: WoW must be running.\n";
	} else {
		DWORD pid;
		GetWindowThreadProcessId(hWnd, &pid); // get its process id from its window handle
		HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid); // open the process
		if(!hProcess) {
			cout << "Error: Could not attach.\n";
		} else {
			DWORD datasize = sizeof( percent ); // get the size of the new value
			(WriteProcessMemory(hProcess, (LPVOID) 0xE96AFFFFFF909090, &percent, datasize, NULL) // write the new speed
			(WriteProcessMemory(hProcess, (LPVOID) 0x85F60F86F2000000, &percent, datasize, NULL)));
			{
			cout << "Speed set to" << percent << "%.\n";
			}
			CloseHandle(hProcess); // close the handle to the process
		}
	}
	if (argv = NULL) {
		main; // restart 
	}
	return 0;
}

I searched google and couldn't find anything. Anyone know how to fix the errors?

[Athar]

Variables are destroyed at the end of their scope and are not visible outside of it.

[GhqjLyTq]

Alright, that fixed it, but now im getting these errors:

error LNK2028: unresolved token (0A0003CC) "extern "C" struct HWND__ * __stdcall FindWindowA(char const *,char const *)" (?FindWindowA@@$$J18YGPAUHWND__@@PBD0@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)

error LNK2028: unresolved token (0A000488) "extern "C" unsigned long __stdcall GetWindowThreadProcessId(struct HWND__ *,unsigned long *)" (?GetWindowThreadProcessId@@$$J18YGKPAUHWND__@@PAK@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)

error LNK2019: unresolved external symbol "extern "C" unsigned long __stdcall GetWindowThreadProcessId(struct HWND__ *,unsigned long *)" (?GetWindowThreadProcessId@@$$J18YGKPAUHWND__@@PAK@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)

error LNK2019: unresolved external symbol "extern "C" struct HWND__ * __stdcall FindWindowA(char const *,char const *)" (?FindWindowA@@$$J18YGPAUHWND__@@PBD0@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)

[Athar]

You probably forgot to link something, I guess googling for the error message will help you with that.
But first fix the remaining errors:
1. The main declaration should be: int main (int argc, char** argv)
2. The equality comparison operator is ==, not =.
3. main is not a function call. It just takes main's address and discards it. You cannot call main yourself anyway, since that results in undefined behavior. Use loops instead.

[GhqjLyTq]

Got it to compile now, thanks for your help.