怎样可以用指针来实现数组最大值最小值的功能呢？

#include<stdio.h>
void minmax(int a[], int len, int *max, int *min);

int main(void)
{
    int a[] = {1,2,3,4,5,6,7,8,12,13,14,16,17,21,23,55};
    int min, max;
    minmax(a, sizeof(a)/sizeof(a[0]), &min, &max);
    printf("min=%d, max=%d\n", min, max);
    
    return 0;
}

void minmax(int a[], int len, int *min, int *max)
{
    int i;
    *min = *max=a[0];
    for ( i=1; i<len;i++) {
        if(a[i]<*min){
            *min = a[i];
        }
        if(a[i]>*max){
            *max=a[i];
        }
    }
}