View Compilation Error

0_0_18452311_28545.cpp: In function 'int main()':
0_0_18452311_28545.cpp:11:35: error: 'strcmp' was not declared in this scope
         if(strcmp(str,"ENDOFINPUT")==0)
                                   ^
0_0_18452311_28545.cpp:13:30: error: 'strcmp' was not declared in this scope
         if(strcmp(str,"START")!=0&&strcmp(str,"END")!=0)
                              ^
0_0_18452311_28545.cpp:15:23: error: 'strlen' was not declared in this scope
         len=strlen(str);
                       ^