View Compilation Error

0_0_26179071_28143.cpp: In function 'int main()':
0_0_26179071_28143.cpp:7:18: error: 'strcmp' was not declared in this scope
   if(strcmp(s,"0")==0)   break;
                  ^
0_0_26179071_28143.cpp:8:18: error: 'strlen' was not declared in this scope
  int len=strlen(s); 
                  ^