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c:stdlib.h:rand

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c:stdlib.h:rand [2013/01/22 22:02] (current)
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 +{{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
 +
 +   
  
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c/stdlib.h/rand.txt · Last modified: 2013/01/22 22:02 (external edit)

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