View Compilation Error

0_0_33882171_27231.cpp: In function 'int main()':
0_0_33882171_27231.cpp:5:11: error: 'gt' was not declared in this scope
 while(cin>>h>>u>>d>>f && h){
           ^
0_0_33882171_27231.cpp:5:13: error: expected ')' before ';' token
 while(cin>>h>>u>>d>>f && h){
             ^
0_0_33882171_27231.cpp:5:14: error: expected primary-expression before '>' token
 while(cin>>h>>u>>d>>f && h){
              ^
0_0_33882171_27231.cpp:25:1: error: expected '}' at end of input
 }
 ^