Language: C++

#include <iostream>
using namespace std;

int main () 
{
int a,b;
cin >> a >> b;

if ( a < b ) cout << ???a < b??? << endl;
else if ( a > b ) cout << ???a > b??? << endl;
else cout << ???a == b??? << endl;

return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: expected primary-expression before '?' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                      ^
a.cc:9:23: error: expected primary-expression before '?' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                       ^
a.cc:9:24: error: expected primary-expression before '?' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                        ^
a.cc:9:31: error: expected primary-expression before '?' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                               ^
a.cc:9:32: error: expected primary-expression before '?' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                ^
a.cc:9:34: error: expected primary-expression before '<<' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                  ^~
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:9:41: error: expected ':' before ';' token
    9 | if ( a < b ) cout << ???a < b??? << endl;
      |                                         ^
      |                                         :
a.cc:9:41: error: expected primary-expression before ';' token
a.cc:10:27: error: expected primary-expression before '?' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                           ^
a.cc:10:28: error: expected primary-expression before '?' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                            ^
a.cc:10:29: error: expected primary-expression before '?' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                             ^
a.cc:10:36: error: expected primary-expression before '?' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                    ^
a.cc:10:37: error: expected primary-expression before '?' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                     ^
a.cc:10:39: error: expected primary-expression before '<<' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                       ^~
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:10:46: error: expected ':' before ';' token
   10 | else if ( a > b ) cout << ???a > b??? << endl;
      |                                              ^
      |                                              :
a.cc:10:46: error: expected primary-expression before ';' token
a.cc:11:14: error: expected primary-expression before '?' token
   11 | else cout << ???a == b??? << endl;
      |              ^
a.cc:11:15: error: expected primary-expression before '?' token
   11 | else cout << ???a == b??? << endl;
      |               ^
a.cc:11:16: error: expected primary-expression before '?' token
   11 | else cout << ???a == b??? << endl;
      |                ^
a.cc:11:24: error: expected primary-expression before '?' token
   11 | else cout << ???a == b??? << endl;
      |                        ^
a.cc:11:25: error: expected primary-expression before '?' token
   11 | else cout << ???a == b??? << endl;
      |                         ^
a.cc:11:27: error: expected primary-expression before '<<' token
   11 | else cout << ???a == b??? << endl;
      |                           ^~
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token
a.cc:11:34: error: expected ':' before ';' token
   11 | else cout << ???a == b??? << endl;
      |                                  ^
      |                                  :
a.cc:11:34: error: expected primary-expression before ';' token