//用指針變量完成上題
#include<stdio.h>
int main()
{
    void inv(int *x,int n);
    int i,a[10]={3,7,9,11,0,6,7,5,4,2};
    printf("The ariginal array:\n");
    for(i=0;i<10;i++)
    printf("%d",a[i]);
    printf("\n");
    inv(a,10);
    printf("The array has been inverted:\n");
    for(i=0;i<10;i++)
      printf("%d",a[i]);
      printf("\n");
    getchar();
} 
void inv(int *x,int n)
{
     int *p,temp,*i,*j,m=(n-1)/2;
        i=x;j=x+n-1;p=x+m;
     for(;i<=p;i++,j--)
     {
                      temp=*i;
                      *i=*j;
                      *j=temp;
     }
     return;
}