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using namespace std;
int main()
   {
   }

using namespace std;

#define ohCrap -1
int main {
   return ohCrap;
   }

#define workHard while(true) ;
<h1>define goodLuckGettingHere -1</h1>

int main() {
   workHard;
   return goodLuckGettingHere;
   }

// licensed according to the CPOL
// https://www.codeproject.com/info/cpol10.aspx

#include <cstdlib>

int main()
{
   return EXIT_FAILURE;
}

CPOL 1.02:

a. You agree not to remove any of the original copyright, patent, trademark, and attribution notices and associated disclaimers that may appear in the Source Code or Executable Files.
b. You agree not to advertise or in any way imply that this Work is a product of Your own.

CPOL 1.02:

f. You agree not to use the Work for illegal, immoral or improper purposes, or on pages containing illegal, immoral or improper material. The Work is subject to applicable export laws. You agree to comply with all such laws and regulations that may apply to the Work after Your receipt of the Work.

CPallini wrote:

convert C++ code to C, not the opposite