View Compilation Error

0_0_33662924_6735.cpp: In function 'int main()':
0_0_33662924_6735.cpp:4:35: error: 'scanf' was not declared in this scope
     while(~scanf("%c%c%c",&a,&b,&c)){
                                   ^
0_0_33662924_6735.cpp:5:17: error: 'getchar' was not declared in this scope
         getchar();
                 ^
0_0_33662924_6735.cpp:9:35: error: 'printf' was not declared in this scope
          printf("%c %c %c\n",a,b,c);
                                   ^