Open Watcom is a C/C++ compiler, and offers a Linear Congruential Generator in its standard library.

Because this is mainly a DOS compiler, it also masks the result so that only the last 15 bits are returned.

// This code is adapted from the Open Watcom
// source code found here:
//
// https://github.com/open-watcom/open-watcom-v2

// The current state value
state = 1138;

// Our constants
a = 1103515245;
c = 12345;

// random number generator
function RandomNumber() {

	// Run the function
	state = (a * state) + c;

	// Return the new value
	return (state SHIFT_RIGHT 16) AND $7FFF;

}