srand

raw OCR

Initializes random number generator.

Defined in header <stdlib.h>

Syntax

#include <stdlib.h>
void srand (unsigned seed);

Portability

DOS	UNIX	Windows	ANSI C	C++ only
■	■	■	■

Remarks

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));
   printfC'Ten random numbers  from 0 to 99\n\n");
   for(i=0; i<10; i++)
      printf("%d\n", randO   % 100);
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

cppreference (search)
POSIX (search)
Microsoft C runtime (search)

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Stable link: /3.1/stdlib.h/srand/ · short form /3.1/srand/