View Compilation Error

0_0_39220299_23025.cpp: In function 'int main()':
0_0_39220299_23025.cpp:6:9: error: 'cin' was not declared in this scope
    6 |         cin >> t >> n >> m;
      |         ^~~
0_0_39220299_23025.cpp:13:20: error: 'cout' was not declared in this scope
   13 |         if (i != 1)cout << '\n';
      |                    ^~~~
0_0_39220299_23025.cpp:15:9: error: 'printf' was not declared in this scope
   15 |         printf("Case %d: %.2lf\n", i, ans / m);
      |         ^~~~~~
0_0_39220299_23025.cpp:1:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
  +++ |+#include <cstdio>
    1 | signed main()