动态内存分配输入整数并对其排序输出

#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(void)

{

    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++){

        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++){

        printf("%d\n", array[i]);

    }

    

    return EXIT_SUCCESS;

}