srand

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Header File

stdlib.h

Category

Math Routines

Prototype

void srand(unsigned seed);

Description

Initializes random number generator.

The random number generator is reinitialized by calling srand with an argument value of 1. It can be set to a new starting point by calling srand with a given seed number.

Return Value

None.

Example

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int main(void)
{
   int i;
   time_t t;
   srand((unsigned) time(&t));
   printf("Ten random numbers from 0 to 99\n\n");
   for(i=0; i<10; i++)
       printf("%d\n", rand() % 100);
   return 0;
}

Portability

POSIX	Win32	ANSI C	ANSI C++
+	+	+	+