Using Quick Sort

# include <stdio.h> 
# include <stdlib.h> 
int fun ( const void * , const void * ) ; 
int main( ) 
{
	int a[ ] = { 17, 6, 13, 12, 2 } ; 
	int i ; 
	qsort ( a, 5, sizeof( int ), fun ) ; 
	for( i = 0 ; i <= 4 ; i++ )	
		printf ( "%d\n", a[ i ] ) ; 
}

int fun ( const void *x, const void *y ) 
{
	int *xx, *yy ; 
	xx = ( int * ) x ; 
	yy = ( int * ) y ; 
	return ( *xx -  *yy ) ; 
}