in c++, what happends when i add 1 to the RAND_MAX then take rand () deivded by (RAND_MAX+1) ? if my purpose is to take out a random number within 0=< and = <1?

rand () function is used to generate random integers between the range 0 to RAND_MAX. So if we divide the the rand () function by RAND_MAX the value returned will be 0.

You cannot do RAND_MAX + 1 the compiler will give error integer overflown.

To generate an integer with a range. You have to do like this:

srand (time (0));

int a=-1 * (rand () % (0 - 5245621) + 1);

cout <
This piece of code will return an integer within the range 0 to - 5245622.