Why 1 is added with (rand()%range) ? And why do we use module % between rand() and range ?

Question

This program has to give an output of 4 Digit PIN number randomly.
https://code.sololearn.com/cxM8ELNcpYjd/?ref=app

Answer 1

You need to include the time header and throw time inside the call to srand(). It keeps it more "random", with yhe same seed, you will get the same values every time. You use modulo because numbers generated are random, ex. 3482. To get a single digit, you use modulo with your limit.

https://code.sololearn.com/cI2s5hQ4R7EV/?ref=app

Answer 2

rand() returns a long random
There range is for generate numbers between 1 to range (inclusive).

rand() % range returns a number between 0 to range-1. So add one to get number between 1 to range.

If you want 0 to range-1, don't add one.
Ex: if rand() returns 12345898 and if range=5 then rand()%range returns 3
adding 1 results 4..
Hope it helps..