How is it any harder than using C? Sure, the C standard library gives you random numbers, but it doesn't, for example, give you any containers (hash maps, vectors etc.) which are needed even more often.

> Generate a random number.

Well, obviously, I would use cargo and pull in the `rand` package, because I'm not an anti-dependencies ideologue. Cargo makes it easier to depend on third-party code; that's the whole point. But the OP explicitly doesn't want that, so presumably he'd write his own RNG from scratch, or download a tarball of the `rand` package and build it manually without cargo. None of this is any harder in Rust than it would be in C or C++.