It’s not changing. However, above that “case 4:” there’re another cases, “case 10: case 28: case 30: case 92: ” without break at the end of the code. Unlike so

It’s not changing. However, above that “case 4:” there’re another cases, “case 10: case 28: case 30: case 92: ” without break at the end of the code. Unlike some other languages, in C and C++ this means execution continues to the next case. The behavior is called "switch statement fallthrough". That source code has the comment saying “No break. Continues to next line.”