c语言中，如何将方法的形参由数组改为指向数组的指针？

我讲方法里面的形参由数组改为了指向数组的指针，为什么运行的时候只能输入一个n值就结束了？代码如下，有点混乱，请求指点🙏

#include "stdio.h"
#define MAXNUM 20
typedef int ElemType;
void Create(ElemType *p,int *n){
    int i;
    printf("\nPlease input n=");
    scanf("%d",&*n);
    printf("Please input %d data:",*n);
    for(i=1;i<=*n;i++)    
           scanf("%d",*(p+i));


}
void Maxmin(ElemType *p,int n,int *max,int *min,double *average){
    int i,sum;
    sum=0;
    *average=0;
    *max=*min=*(p+1);
    for(i=1;i<=n;i++){
        if(*(p+i)>*max)        *max=*(p+i);
        if(*(p+i)<*min)        *min=*(p+i);
        sum+=*(p+i);
    }
    *average=sum/(n*1.0);
}
void main(){

    int i,n,max,min;

    ElemType a[MAXNUM+1];

    ElemType *p;
    double average;
    Create(p,&n);
    printf("\nCreate is completed!\nThe data is:");
    for(i=1;i<=n;i++)
           printf("%4d",*(p+i));
    Maxmin(p,n,&max,&min,&average);
    printf("\nmax=%d    min=%d\naverage=%f\n",max,min,average);
}

帮你修改好了

#include <stdio.h>

#define MAXNUM 20

typedef int ElemType;

void Create(ElemType *p, int *n)
{
    int i;
    printf("Please input n=");
    scanf("%d", n);
    printf("Please input %d data:", *n);
    for (i = 1; i <= *n; i++)
        scanf("%d", p + i);
}

void Maxmin(ElemType *p, int n, int *max, int *min, double *average)
{
    int i, sum = 0;
    *max = *min = *(p + 1);
    for (i = 1; i <= n; i++)
    {
        if (*(p + i) > *max)
            *max = *(p + i);
        if (*(p + i) < *min)
            *min = *(p + i);
        sum += *(p + i);
    }
    *average = (double)sum / n;
}

int main()
{

    int i, n, max, min;
    ElemType a[MAXNUM + 1];
    ElemType *p = a;
    double average;
    Create(p, &n);
    printf("Create is completed!\nThe data is:");
    for (i = 1; i <= n; i++)
        printf("%4d", *(p + i));
    Maxmin(p, n, &max, &min, &average);
    printf("\nmax=%d    min=%d\naverage=%f\n", max, min, average);
    return 0;
}

你p没初始化呀。p=a;应该就可以了。其它错误再说。