View Compilation Error

0_0_30594202_22026.cpp: In function 'int main()':
0_0_30594202_22026.cpp:6:15: error: 'scanf' was not declared in this scope
  scanf("%d", T);
               ^
0_0_30594202_22026.cpp:21:24: error: 'printf' was not declared in this scope
   printf("Case %d: ", j);
                        ^
0_0_30594202_22026.cpp:23:14: error: 'puts' was not declared in this scope
    puts("Yes");
              ^
0_0_30594202_22026.cpp:25:13: error: 'puts' was not declared in this scope
    puts("No");
             ^