srand

Remonter à Stdlib.h - Index

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++
+	+	+	+