程序代码：

#include <stdio.h>
#include <stdlib.h>

void prt_arr(int *p, int i) {
    int j;

    for(j = 0; j < i; j++) {
        printf("%d ", *(p + j));
    }
}

void sort_arr(int *p, int i) {
    int j, k, t = 0;
    i--;

    for(j = 0; j < i; j++) {
        for(k = 0; k < (i - j); k++) {
            if(*(p + k) > *(p + k + 1)) {
                t =  *(p + k);
                *(p + k) = *(p + k + 1);
                *(p + k + 1) = t;
            }
        }
    }
}

int add_num(int *p, int i) {
    i++;
    p = realloc(p, i * (sizeof(int)));

    if(p != NULL) {
        scanf("%d", p + i - 1);

    } else {
        printf("ERROR REALLOC!\n");
        exit(1);
    }

    return i;
}



int main(void) {
    int i = 0 , num, *parr_num = malloc(1 * sizeof(int));

    if(parr_num != NULL) {
        while(scanf("%d", &num) > 0) {
            *(parr_num + i) = num;
            parr_num = realloc(parr_num, (i + 2) * (sizeof(int)));

            if(parr_num != NULL) {
                i++;

            } else {
                printf("ERROR REALLOC!\n");
                exit(1);
            }
        }

    } else {
        printf("ERROR MALLOC!\n");
        exit(1);
    }

    printf("数组长为: %d\n", i);

    if(i > 0) {
        prt_arr(parr_num, i);
        printf("\n");
        sort_arr(parr_num, i);
        prt_arr(parr_num, i);
        printf("\n");
    }

    fflush(stdin);
    i = add_num(parr_num, i);
    sort_arr(parr_num, i);
    prt_arr(parr_num, i);
    printf("\n");
    free(parr_num);
    return 0;
}