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:10:9: error: expected primary-expression before '?' token
   10 | cout << ???a < b??? << endl;
      |         ^
a.cc:10:10: error: expected primary-expression before '?' token
   10 | cout << ???a < b??? << endl;
      |          ^
a.cc:10:11: error: expected primary-expression before '?' token
   10 | cout << ???a < b??? << endl;
      |           ^
a.cc:10:18: error: expected primary-expression before '?' token
   10 | cout << ???a < b??? << endl;
      |                  ^
a.cc:10:19: error: expected primary-expression before '?' token
   10 | cout << ???a < b??? << endl;
      |                   ^
a.cc:10:21: error: expected primary-expression before '<<' token
   10 | cout << ???a < b??? << endl;
      |                     ^~
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:10:28: error: expected ':' before ';' token
   10 | cout << ???a < b??? << endl;
      |                            ^
      |                            :
a.cc:10:28: error: expected primary-expression before ';' token
a.cc:13:9: error: expected primary-expression before '?' token
   13 | cout << ???a > b??? << endl;
      |         ^
a.cc:13:10: error: expected primary-expression before '?' token
   13 | cout << ???a > b??? << endl;
      |          ^
a.cc:13:11: error: expected primary-expression before '?' token
   13 | cout << ???a > b??? << endl;
      |           ^
a.cc:13:18: error: expected primary-expression before '?' token
   13 | cout << ???a > b??? << endl;
      |                  ^
a.cc:13:19: error: expected primary-expression before '?' token
   13 | cout << ???a > b??? << endl;
      |                   ^
a.cc:13:21: error: expected primary-expression before '<<' token
   13 | cout << ???a > b??? << endl;
      |                     ^~
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:13:28: error: expected ':' before ';' token
   13 | cout << ???a > b??? << endl;
      |                            ^
      |                            :
a.cc:13:28: error: expected primary-expression before ';' token
a.cc:15:9: error: expected primary-expression before '?' token
   15 | cout << ???a == b??? << endl;}
      |         ^
a.cc:15:10: error: expected primary-expression before '?' token
   15 | cout << ???a == b??? << endl;}
      |          ^
a.cc:15:11: error: expected primary-expression before '?' token
   15 | cout << ???a == b??? << endl;}
      |           ^
a.cc:15:19: error: expected primary-expression before '?' token
   15 | cout << ???a == b??? << endl;}
      |                   ^
a.cc:15:20: error: expected primary-expression before '?' token
   15 | cout << ???a == b??? << endl;}
      |                    ^
a.cc:15:22: error: expected primary-expression before '<<' token
   15 | cout << ???a == b??? << endl;}
      |                      ^~
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token
a.cc:15:29: error: expected ':' before ';' token
   15 | cout << ???a == b??? << endl;}
      |                             ^
      |                             :
a.cc:15:29: error: expected primary-expression before ';' token