C Reference function rand() generate a random number

This function of stdlib will generate a random number.

Usage of rand():

int rand (void);

Parameters:

The function rand() returns a pseudo-random integral number.
This number will be in the range 0 to RAND_MAX. The algorithm of rand() uses a seed to generate the series of numbers, this is why srand must be used to initialize the seed to some distinctive value.

The constant RAND_MAX is defined in standard library (stdlib).

The random numbers are delivered from a predetermined range.

Return value:

Will return an integer value between 0 and RAND_MAX.

Source code example of rand():

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

	int main ()
	{
		int number, input;
		/* initialize random seed: */
		srand ( time(NULL) );
		/* Generate a random number: */
		number = rand() % 10 + 1;
		do {
				printf ("Guess the number (1 to 10): ");
				scanf ("%d",&input);
				if (numberinput)
					printf ("The number is higher\n");
			} while (number!=input);
		printf ("That is correct!\n");
		return 0;
	}