View Compilation Error

0_0_17910978_22090.cpp: In function 'int main(int, char**)':
0_0_17910978_22090.cpp:30:27: error: 'strcmp' was not declared in this scope
         if (strcmp(s,"END")==0) break;
                           ^
0_0_17910978_22090.cpp:31:21: error: 'strlen' was not declared in this scope
         len=strlen(s);
                     ^