What is the function of the rand function in C++?

The rand function is a random number generation function in the C++ standard library, which generates a pseudo-random number. Pseudo-random numbers are a series of numbers generated using a deterministic seed value when using a random number algorithm, appearing to be random. The rand function can be used to generate a random integer between 0 and RAND_MAX, where RAND_MAX is a predefined constant representing the maximum value of a random number. By performing arithmetic and logical operations on the generated random numbers, it is possible to further obtain random numbers that meet specific requirements.