How to generate random numbers using C++?

Let us see how to generate random numbers using C++. Here we are generating a random number in range 0 to some value. (In this program the max value is 100). To perform this operation we are using the srand () function. This is in the C library. The function void srand (unsigned int seed) seeds the random number generator used by the function rand.

Is random a standard ANSI C function?

But as far as I can tell, random () is not standard ANSI C. A third-party library may not be a bad idea, but it all depends on how random of a number you really need to generate. You want to use rand (). Note ( VERY IMPORTANT ): make sure to set the seed for the rand function. If you do not, your random numbers are not truly random.

Is Rand a bad number generator?

The random numbers that rand () produces are often very bad. To quote from the Linux man page: The versions of rand () and srand () in the Linux C Library use the same random number generator as random (3) and srandom (3), so the lower-order bits should be as random as the higher-order bits.

How many real numbers are there in a random number generator?

There are infinitely-many real numbers from 0 to 0.5, each with a probability of 0% of being chosen by your hypothetical random number generator. To try to salvage this question, I will ask you: to how many decimal places do you want to generate these random numbers? You cannot generate a really random number in portable C99.