指针例题1

#include <stdio.h>
void minmax(int *a, int len, int *min, int *max);
int main(void)
{
    int a[] = {
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        12,
        13,
        14,
        16,
        17,
        21,
        23,
        55,
    };
    int min, max;
    printf("main sizeof(a) = %d
", sizeof(a));
    printf("main a = %p
", a);
    minmax(a, sizeof(a) / sizeof(a[0]), &min, &max);
    printf("a[0] = %d
", a[0]);
    printf("min = %d, max = %d
", min, max);
    int *p = &min;
    printf("*p = %d
", *p);
    printf("p[0] = %d
", p[0]);
    printf("*a = %d
", *a);
    return 0;
}
void minmax(int *a, int len, int *min, int *max)
{
    printf("minmax sizeof(a) = %d
", sizeof(a));
    printf("main a = %p
", a);
    a[0] = 1000;
    *min = *max = a[0];
    for (int i = 1; i < len; i++)
    {
        if (a[i] < *min)
        {
            *min = a[i];
        }
        if (a[i] > *max)
        {
            *max = a[i];
        }
    }
}