Probability-based gaming?

Ive come across this term as of recently and now i cant stop seeing it.

If anyone knows what this is, and can potentially provide me with some pseudo code as to how it may be implemented i would appreciate it

to me it may be something like this

void generate() {

int result rand(0,100);

if result < 50 { do this }
if result > 50 { do that }

}

obviously this is supposed to represent a coin flip but it can have any code after the call to rand

EDIT: WOOPS


i thoroughly apologize i actually asked this question a long time ago