View Compilation Error

0_0_28534431_7447.cpp: In function 'int main()':
0_0_28534431_7447.cpp:14:32: error: 'strcmp' was not declared in this scope
   for (a = 0; strcmp(in, fun[a]) != 0; a++);
                                ^
0_0_28534431_7447.cpp:17:32: error: 'strcmp' was not declared in this scope
   for (a = 0; strcmp(in, fun[a]) != 0; a++);
                                ^