View Compilation Error

0_0_34231676_3969.cpp: In function 'int main()':
0_0_34231676_3969.cpp:32:60: error: 'strcmp' was not declared in this scope
  while (scanf("%d%s", &target, c),(target || strcmp(c,"END"))) {
                                                            ^
0_0_34231676_3969.cpp:33:18: error: 'strlen' was not declared in this scope
   clen = strlen(c);
                  ^
0_0_34231676_3969.cpp:4:35: error: 'memset' was not declared in this scope
 #define mst(a) memset(a,0,sizeof a)
                                   ^
0_0_34231676_3969.cpp:37:3: note: in expansion of macro 'mst'
   mst(vis);
   ^