How to have C++ press keys at random

I am looking at creating a program that rolls 5 random numbers, and depending on what those numbers are it press 5 different keys.

I know how to generate 5 different random numbers, but how can I have it simulate key presses so it works in a different application? I'm going to use it to randomly buy stuff in a game. I read that it's Keypress() but I'm not sure what the syntax is

Thanks!