View Compilation Error

0_0_18596481_13949.cpp: In function 'int main()':
0_0_18596481_13949.cpp:63:31: error: 'strcmp' was not declared in this scope
             if(strcmp(c,"PUSH")==0)
                               ^
0_0_18596481_13949.cpp:68:30: error: 'strcmp' was not declared in this scope
             if(strcmp(c,"POP")==0)
                              ^
0_0_18596481_13949.cpp:72:32: error: 'strcmp' was not declared in this scope
             if(strcmp(c,"QUERY")==0)
                                ^
0_0_18596481_13949.cpp:78:34: error: 'strcmp' was not declared in this scope
             if(strcmp(c,"REVERSE")==0)
                                  ^