View Compilation Error

0_0_22440073_26441.cpp: In function 'int main()':
0_0_22440073_26441.cpp:4:30: error: 'scanf' was not declared in this scope
 while(scanf("%c%c%c",&a,&b,&c)!=EOF);
                              ^
0_0_22440073_26441.cpp:4:33: error: 'EOF' was not declared in this scope
 while(scanf("%c%c%c",&a,&b,&c)!=EOF);
                                 ^
0_0_22440073_26441.cpp:18:26: error: 'printf' was not declared in this scope
 printf("%c %c %c\n",a,b,c);
                          ^