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

In the first case there are two possibilities:

• seed is a random variable (less possible)
• seed is constant on every run (more possible)

time(NULL) returns the time of the system which is 99.99% different every time you run the code.

Nothing is perfect random, but using time(NULL) gives you a "more random" number then if you would use the first approach.

You should check function's usage http://www.cplusplus.com/reference/cstdlib/srand/