Is it good idea to pass uninitialized variable to srand?

Question

Is it good idea to pass uninitialized variable to srand instead of result of time(NULL)?
It is one #include and one function call

Answer 1

No, accessing uninitialized variable is an undefined behavior. You should prefer time(NULL). Uninitialized variable method may introduce difficult to find bugs or may blow the computer.

Most of the time, effect observed would be, (on most implementation) above code would take (read) some leftover value from the stack that may be zero or something else but may be same on multiple runs defeating your purpose. time on the other hand is promising.