View Compilation Error

0_0_19796357_13998.cpp: In function 'void input(char*, char*)':
0_0_19796357_13998.cpp:10:27: error: 'strcmp' was not declared in this scope
  while(strcmp(temp,"START")!=0)
                           ^
0_0_19796357_13998.cpp:14:23: error: 'strcmp' was not declared in this scope
   if(strcmp(temp,"END")==0)break;
                       ^
0_0_19796357_13998.cpp:15:17: error: 'strlen' was not declared in this scope
   if(strlen(temp)!=0)strcat(a,temp);
                 ^
0_0_19796357_13998.cpp:15:35: error: 'strcat' was not declared in this scope
   if(strlen(temp)!=0)strcat(a,temp);
                                   ^
0_0_19796357_13998.cpp:16:16: error: 'strcat' was not declared in this scope
   strcat(a,"\n");
                ^
0_0_19796357_13998.cpp:19:18: error: 'strlen' was not declared in this scope
  int len=strlen(a);
                  ^
0_0_19796357_13998.cpp: In function 'int main()':
0_0_19796357_13998.cpp:37:18: error: 'strcmp' was not declared in this scope
   if(strcmp(a1,a2)==0)cout<<"Accepted"<<endl;
                  ^