rand

Remonter à Stdlib.h - Index

Header File

stdlib.h

Category

Math Routines

Prototype

int rand(void);

Description

Random number generator.

rand uses a multiplicative congruential random number generator with period 2 to the 32nd power to return successive pseudo-random numbers in the range from 0 to RAND_MAX. The symbolic constant RAND_MAX is defined in stdlib.h.

Return Value

rand returns the generated pseudo-random number.

Example

 #include <stdlib.h>
 #include <stdio.h>
 int main(void)
 {
     int i;
     randomize();
     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++
+	+	+	+