Easy to error: variables defined in C ++ switch case

I want to write down more than once, in case you can look at it again.

The following code will report an error

Int I = 0; switch (I) {case 1: int j = 1; break; case 2: I ++; break; default: break ;}

Error 1
Error C2360: initialization of 'J' is skipped by 'case' label
D: \ programing \ windows \ basicwindows \ varable_list_test \ varable_list_test.cpp
55

Error 2
Error C2361: initialization of 'J' is skipped by 'default' label
D: \ programing \ windows \ basicwindows \ varable_list_test \ varable_list_test.cpp
58

To:

Int I = 0; switch (I) {case 1: {int j = 1;} break; case 2: I ++; break; default: break ;}