View Compilation Error

0_0_30594193_15235.cpp: In function 'int main()':
0_0_30594193_15235.cpp:8:15: error: 'scanf' was not declared in this scope
  scanf("%d", T);
               ^
0_0_30594193_15235.cpp:23:24: error: 'printf' was not declared in this scope
   printf("Case %d: ", j);
                        ^
0_0_30594193_15235.cpp:25:14: error: 'puts' was not declared in this scope
    puts("Yes");
              ^
0_0_30594193_15235.cpp:27:13: error: 'puts' was not declared in this scope
    puts("No");
             ^