C Reference function srand() initialize random number generator

This function of stdlib will initialize the random number generator that can be used with the rand() function.

Usage of srand():

void srand ( unsigned int seed );

The function srand() is used to initialize the pseudo-random number generator by passing the argument seed.
Often the function time is used as input for the seed.

If the seed is set to 1 then the generator is reinitialized to its initial value. Then it will produce the results as before any call to rand and srand.

Parameters:

An integer value to initialize the random number generator. Often the function time is used as input for the seed.

Return value:

There is nothing returned by srand.

Source code example of srand():

	#include<stdio.h>
	#include<stdlib.h>
	#include<time.h>

	int main ()
	{
		printf ("Our first number: %d\n", rand() % 100);
		srand ( time(NULL) );

		printf ("Some random number: %d\n", rand() % 100);
		srand ( 1 );

		printf ("The first number again: %d\n", rand() %100);

		return 0;
	}

Output of the srand example program above:

	Our first number: 41
	Some random number: 4
	The first number again: 41