Generate pseudo-random 16 bit number

I want to generate a 16 bit pseudo-random number using only 16 bit variables. This will then be used to generate pseudo-random numbers in the range mn to mx (typically 10 to 700). I've come across this code in c:

Code:

---

short x = 3030;
 
unsigned xorshift( )
{
    x ^= x << 7;
    x ^= x >> 9;
    x ^= x << 8;
    return x;
}

short getrnd(short mn, short mx) {
        short r = xorshift();
        short mod = mx - mn + 1;
        r = r % mod;
        r = r + mn;
        return r;
}

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The language is un-important. I'm more interested in the algorithm used. The algorithm needs to be fairly simple and quick. This seems to be ok but is there a better algorithm than this please?

https://github.com/ZiCog/xoroshiro

It looks like xoroshiro32++ is a better 16-bit PRNG as it uses rotation in addition to xor and shift only.