C++ No-repeat random number generator

Question

I need to create algorithm implementation in C++ to generate random numbers to f.e table without repeat and list.

I created something code like that but it\'s stop w

Answer 1

rand() % n

will never give you a number larger than RAND_MAX. RAND_MAX is the range of the numbers generated by rand().

If you use a value of n larger than RAND_MAX, you will loop forever after you draw the first RAND_MAX numbers. Simply, there's no numbers left to draw.

You need to improve your solution to be able to generate larger numbers, or use something better like shuffling a larger list of numbers.

Your algorithm has many issues, but an immediate simple fix would be:

rnd_number = (rand() * (RAND_MAX + 1) + rand()) % n;