foo.cc: In function ‘int main()’:
foo.cc:7:19: error: ‘Even’ was not declared in this scope
    7 |  if(x%2==0){cout<<Even;}
      |                   ^~~~
foo.cc:8:13: error: ‘Odd’ was not declared in this scope
    8 |  else{cout<<Odd;}
      |             ^~~
foo.cc:4:8: warning: unused variable ‘b’ [-Wunused-variable]
    4 | {int x,b;
      |        ^