View Compilation Error

0_0_32835205_5599.cpp: In function 'int main()':
0_0_32835205_5599.cpp:18:28: error: 'strcmp' was not declared in this scope
   if (m==0&&!strcmp(s,"END")) break;
                            ^
0_0_32835205_5599.cpp:20:24: error: 'strlen' was not declared in this scope
   for (int i = strlen(s)-1; i >= 0; i--) {
                        ^