foo.cc: In function ‘int main()’:
foo.cc:5:21: error: ‘INT_MEX’ was not declared in this scope; did you mean ‘INT_MAX’?
    5 |         int a,b,c,d=INT_MEX,e=0,f=0;
      |                     ^~~~~~~
      |                     INT_MAX
foo.cc:10:17: error: ‘f’ was not declared in this scope
   10 |                 f=ceil(a*1.0/b);
      |                 ^
foo.cc:11:17: error: ‘e’ was not declared in this scope
   11 |                 e=f*c;
      |                 ^