What‘s the difference between srand(1) and srand(0)

Question

I just found out the hard way that srand(1) resets the PRNG of C(++) to the state before any call to srand (as defined in the reference). However,

Answer 1

When reading manual pages, they all state that "If no seed value is provided, the rand() function is automatically seeded with a value of 1." This is probably why the reference page you link to states that seeding with 1 resets the state.

That the same result happens for seeding with both 0 and 1 is most likely implementation dependant, and should not be counted on happening on all platforms.