How can I generate a random number between 0 and 4 in c++? [duplicate]

You could call std::rand(), usning the modulo operator to limit the range to the desired one.

std::rand()%5

You can also have a look at the new C++11 random number generation utilities

Just for completeness I show you a C++11 solution using the new random facility:

#include <random>
#include <ctime> 

int main() {
    std::minstd_rand generator(std::time(0)); 
    std::uniform_int_distribution<> dist(0, 4);
    int nextRandomInt = dist(generator);
    return 0;
}