Quick sort

Quick sort

#include "conio.h"
#include "stdio.h"

int split ( int*, int, int ) ;

void main( )
{
int arr[10] = { 11, 2, 9, 13, 57, 25, 17, 1, 90, 3 } ;
int i ;

void quicksort ( int *, int, int ) ;

clrscr( ) ;

printf ( "Quick sort.\n" ) ;
printf ( "\nArray before sorting:\n") ;

for ( i = 0 ; i <= 9 ; i++ ) printf ( "%d\t", arr[i] ) ; quicksort ( arr, 0, 9 ) ; printf ( "\nArray after sorting:\n") ; for ( i = 0 ; i <= 9 ; i++ ) printf ( "%d\t", arr[i] ) ; getch( ) ; } void quicksort ( int a[ ], int lower, int upper ) { int i ; if ( upper > lower )
{
i = split ( a, lower, upper ) ;
quicksort ( a, lower, i - 1 ) ;
quicksort ( a, i + 1, upper ) ;
}
}

int split ( int a[ ], int lower, int upper )
{
int i, p, q, t ;

p = lower + 1 ;
q = upper ;
i = a[lower] ;

while ( q >= p )
{
while ( a[p] <> i )
q-- ;

if ( q > p )
{
t = a[p] ;
a[p] = a[q] ;
a[q] = t ;
}
}

t = a[lower] ;
a[lower] = a[q] ;
a[q] = t ;

return q ;
}