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c:stdlib.h:srand

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c:stdlib.h:srand [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +===== srand =====
  
 +<code c>
 +    #include <stdlib.h>
 +    void srand(unsigned int seed);
 +</code>
 +===== Description =====
 +srand is used to initialize the random number generator.\\
 +The use of date / time to initialize the generator \\
 +means that the generated sequence of numbers "random" is.\\
 +
 +    <time.h> is for this example nessesary
 +===== srand C Sourcecode Example =====
 +<code c>
 +/*
 + * srand exmple code
 + * http://code-reference.com/c/stdlib.h/srand 
 + */
 +#include <stdio.h>
 +#include <stdlib.h>
 +#include <time.h> /* for time to initialize srand */
 + 
 +int main ( void )
 +{
 + 
 +  int i;
 +  /* initialize random generator */
 +  srand ( (unsigned int) time(NULL) ); /* comment it out to see what happend */
 + 
 +  /* random number */
 +  for(i=0; i<=5; i++){
 +      printf("example %i, for srand = %d\n",i, rand());  
 +  }
 +  return 0;
 +}
 +
 +
 +</code>
 +
 +==== output of srand example ====
 +    user@host:~/code-reference.com#  ./srand 
 +    example 0, for srand = 796883283
 +    example 1, for srand = 1140159597
 +    example 2, for srand = 137384045
 +    example 3, for srand = 1204700693
 +    example 4, for srand = 763425562
 +    example 5, for srand = 472690191
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c/stdlib.h/srand.txt · Last modified: 2013/01/22 22:02 (external edit)

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