Probability Generator

[dandymcgee]

This is extremely simple, and I'm sure it's been posted elsewhere, but it could prove useful to someone:

bool Chance(int successRate, int attempts)
{
    return (rand() % attempts) < successRate;
}

Chance(1,100) returns true ~1% of the time, false ~99% of the time.

[Rebornxeno]

How does the < successrate part work?

[dandymcgee]

How does the < successrate part work?

Chance(1,100) generates a random number from 0 to 99 and returns true if it's less than 1.
Assuming rand() was truly random that would happen exactly 1% of the time. Since it's pseudo-random it happens ~1% of the time.

[Rebornxeno]

How does the "< successrate;" part work?

[dandymcgee]

How does the "< successrate;" part work?

Chance(1,100) generates a random number from 0 to 99 and returns true if it's less than 1.
Assuming rand() was truly random that would happen exactly 1% of the time. Since it's pseudo-random it happens ~1% of the time.

[Rebornxeno]

Oh it returns true or false. I get it now.