View Compilation Error

0_0_37006581_21898.cpp: In function 'int main()':
0_0_37006581_21898.cpp:6:43: error: 'scanf' was not declared in this scope
  while(scanf("%c%c%c",&ch[0],&ch[1],&ch[2]) != EOF)
                                           ^
0_0_37006581_21898.cpp:6:48: error: 'EOF' was not declared in this scope
  while(scanf("%c%c%c",&ch[0],&ch[1],&ch[2]) != EOF)
                                                ^
0_0_37006581_21898.cpp:18:40: error: 'printf' was not declared in this scope
   printf("%c %c %c\n",ch[0],ch[1],ch[2]);
                                        ^
0_0_37006581_21898.cpp:19:18: error: 'getchar' was not declared in this scope
   temp = getchar();
                  ^