User Tools

Site Tools


c:stdlib.h:qsort

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

c:stdlib.h:qsort [2013/01/22 22:02] (current)
Line 1: Line 1:
 +{{keywords>wiki library source code example reference}}
 +====== qsort ======
 +
 +<code c>
 +#include <stdlib.h>
 +    void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*));
 +</code>
 +
 +===== Description =====
 +
 +base   = Pointer to elements\\
 +nitems = Number of elements\\
 +size = Size of one element\\
 +compar = Pointer to comparison function\\
 +
 +
 +qsort will sort an array of elements\\
 +with using a comparison function\\
 +
 +
 +===== qsort C Sourcecode Example =====
 +
 +<code c>
 +/* 
 + * qsort example code
 + * http://code-reference.com/c/stdlib.h/qsort 
 + */
 +
 +#include <stdio.h>
 +#include <stdlib.h>
 +
 +int compare(const int *n1, const int *n2)
 +{
 +  if (*n1 == *n2) { return  0; }
 +  else if (*n1 <  *n2) { return -1; }
 +  else if (*n1 >  *n2) { return  1; }
 +  else
 +  return 0;
 +}
 +
 +
 +int main( void )
 +{
 +  int array[]=  {42,43,44,5,23,992,1231,3133,3,9274};
 +  int i;
 +
 +  for (i=0; i<10; i++){
 +     printf ("%d ",array[i]);
 +  }
 +  printf(" not sorted\n");
 +  qsort(array, 10, sizeof(int), (void *)compare );
 +
 + for (i=0; i<10; i++){
 +     printf ("%d ",array[i]);
 +  }
 +  printf(" Sorted with qsort\n");
 +
 +return 0;
 +}
 +</code>
 +
 +==== output of qsort example ====
 +    user@host:~/code-reference.com#  ./qsort 
 +    42 43 44 5 23 992 1231 3133 3 9274  not sorted
 +    3 5 23 42 43 44 992 1231 3133 9274  Sorted with qsort
 +    
 +
 +
 +   
  
advertising
c/stdlib.h/qsort.txt · Last modified: 2013/01/22 22:02 (external edit)

Impressum Datenschutz