C++ IsDebuggerPresent Help?

[dylank]

Hi, I am creating a crackme (or possibly keygenme, if i feel like it) that realys on a IsDebuggerPresent call to see if the user has olly or another debugger open analyzing it. My current code reads as follows:

#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <ctime>
using namespace std;

void debuggerPresent() {
         SYSTEMTIME st, lt;
    
    GetSystemTime(&st);
    GetLocalTime(&lt);
     cout << "Application error or Debugger Present!!!" << endl;
     return;
     }

void noDebug(int mode){
         SYSTEMTIME st, lt;
    
    GetSystemTime(&st);
    GetLocalTime(&lt);
     if(mode = st.wMonth) {
             //Do the main username/password thing here....
     }
     else {
          debuggerPresent();
     }
     return;
}
     
     

int main() {
    BOOL WINAPI IsDebuggerPresent(void);

    SYSTEMTIME st, lt;
    
    GetSystemTime(&st);
    GetLocalTime(&lt);

    int day = st.wMonth;
    
    if(!IsDebuggerPresent) {
         noDebug(day);
         return 0;
         }
    if(IsDebuggerPresent) {
         debuggerPresent();
         system("pause");
         return 0;
         }
    
    return 0;
}

I am getting this error:

41 C:\Dev-Cpp\files\crackMes\debuggerPresent\ver1.cpp [Warning] the address of `BOOL IsDebuggerPresent()', will always evaluate as `true' 
45 C:\Dev-Cpp\files\crackMes\debuggerPresent\ver1.cpp [Warning] the address of `BOOL IsDebuggerPresent()', will always evaluate as `true'

Why is IsDebuggerPresent always returning true?
Also, for those wondering, the date is there to make sure they dont just patch the program to just JMP to the main code.