View Compilation Error

0_0_20139909_24499.cpp: In function 'int main()':
0_0_20139909_24499.cpp:9:39: error: 'strcmp' was not declared in this scope
     while(cin>>str && strcmp(str,"END"))
                                       ^
0_0_20139909_24499.cpp:12:29: error: 'strlen' was not declared in this scope
         int len = strlen(str);
                             ^