View Compilation Error

0_0_20703766_17711.cpp: In function 'int main()':
0_0_20703766_17711.cpp:8:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_20703766_17711.cpp:22:20: error: 'printf' was not declared in this scope
   printf("%d\n",res);
                    ^