程序代码：

#include < stdio.h >
#include < stdlib.h >
int
compare_integers ( void const *a, void const *b )
{
    register int const *pa = a;
    register int const *pb = b;
    return *pa > *pb ? 1 : *pa < *pb ? -1 : 0;

}
int
main ( )
{
    int *array;
    int n_values;
    int i;
    printf ( "How many values are there?" );
    if ( scanf ( "%d", &n_values ) != 1 || n_values <= 0 )
    {
        printf  ( "Illegal number of values.\n" );
        exit ( EXIT_FAILURE );
    }
    array = malloc ( n_values * sizeof ( int ) );
    if ( array == NULL )
    {
        printf ( "Can't get memory for that many values.\n" );
        exit ( EXIT_FAILURE );
    }
    for ( i = 0; i < n_values; i += 1 )
    {
        printf ( "?" );
        if ( scanf ( "%d",array + i ) != 1 )
        {
            printf ( "Error reading value #%d\n", i );
            free  ( array );
            exit ( EXIT_FAILURE );
        }
    }

 qsort ( array, n_values, sizeof ( int ), compare_integers );

 for ( i = 0; i < n_values; i +=1 )
     printf ( "%d\n", array [i] );

 free ( array );

 return EXIT_SUCCESS;
}