View Compilation Error

0_0_34501901_29141.cpp: In function 'int main()':
0_0_34501901_29141.cpp:5:15: error: 'scanf' was not declared in this scope
  scanf("%d",&n);
               ^
0_0_34501901_29141.cpp:21:29: error: 'printf' was not declared in this scope
    printf("%d %d %d\n",a,b,c);
                             ^