View Compilation Error

0_0_14956151_5821.cpp: In function 'int main()':
0_0_14956151_5821.cpp:48:27: error: 'strcmp' was not declared in this scope
   if(n==0&&strcmp(in,"END")==0)
                           ^
0_0_14956151_5821.cpp:50:20: error: 'strlen' was not declared in this scope
   int len=strlen(in);
                    ^