两种访问方式在形式上遵守下面的等价关系:
如: int a[5]={7,9,4,3,8};
int *pa=a;
printf(“%d ”,a[0]); printf(“%d\n”,a[2]);
printf(“%d ”*a); printf(“%d\n”,*(a+2));
printf(“%d ”,*pa); printf(“%d\n”,*(pa+2));
执行结果:7 4
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