How to generate random number in C for this project?

In this assignment, imagine you use the ARM Cortex M4 on your launchpad to interface with sensors. You are required to develop a customized RTOS that is supposed to function on your launchpad with the following features:

(1) Process P1 is responsible for generating measured data. In our case, we don't have real sensor to get data. Instead, design a task for your P1 that generates random data to imitate measured data. The generated random data is organized into an array. The random data array has 100 elements, each element being 4 bytes. (This is to imitate 100 different kinds of chemical measurement in a round of measurement).