{{keywords>wiki library source code example reference}}
====== rand ======

<code c>
    #include <stdlib.h>
    int rand(void);
</code>
===== Description =====
Generates a random Number\\



    <time.h> is for this example nessesary
===== rand C Sourcecode Example 1 =====
<code c>
/* 
 * rand example code
 * http://code-reference.com/c/stdlib.h/rand 
 */
#include <stdio.h>
#include <stdlib.h>
#include <time.h> /* for srand salt */

int main ( void )
{

  int i;
  /* initialize random generator */
  /* without srand, rand will generate only once random numbers */
  srand ( time(NULL) ); /* comment it out to see what happend */

  printf ("random number between 0 and 100: %d\n", rand() % 100);

  /* random number */
  for(i=0; i<=5; i++){
      printf("example %i, rand() = %d\n",i, rand());  
  }
  return 0;
}
</code>

==== output of rand example 1 ====
    user@host:~/code-reference.com#  ./rand
    random number between 0 and 100: 34
    example 0, rand() = 1299618648
    example 1, rand() = 556251950
    example 2, rand() = 1934607721
    example 3, rand() = 1297432736
    example 4, rand() = 1147459184
    example 5, rand() = 1432106816
    

    <time.h> is for this example nessesary
===== rand C Sourcecode Example 2 =====
This example will generate a random number between 2 given int numbers\\
<code c>
/* 
 * rand example code
 * http://code-reference.com/c/stdlib.h/rand 
 */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int rand_between(int min, int max);
         
int main( void ) {

  srand(time(NULL));
  printf("rand between   5 -   42 : %d\n",rand_between(5,42));
  printf("rand between 800 - 1000 : %d\n",rand_between(800,1000));
  return 0;
}
         
int rand_between(int min,int max){ 

     return(rand()%(max-min)+min); 
}
</code>

==== output of rand example 2 ====
    user@host:~/code-reference.com#  ./rand 
    rand between   5 -   42 : 36
    rand between 800 - 1000 : 923