int a[3];中a+1與&a+1區別 -- C

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int a[3];

a 和 &a 的地址一樣的。

a+1 == a + 1*sizeof(int);跳躍是一個數組元素大小

&a+1 == a + 3*sizeof(int);跳躍是整個數組大小

#include <stdio.h>intmain(){char * a[] = {"hello","the","world"};char ** pa = a;pa ++;/*擷取數組中第二個元素 */printf("*pa = %s\n",*pa);printf("*(a+1) = %s\n",*(a+1));int b[] = {1,2,3};int * pb = b;/*擷取數組中最後一個元素 */printf("*((int *)(&b +1)-1) = %d\n",*((int *)(&b +1)-1));printf("*((int *)((&b +1)-1) = %d\n",*((int *)((&b +1)-1)));printf("*((char **)(&a+1)-1) = %s\n",*((char **)(&a+1)-1));/*地址一樣 */printf("b = 0x%0X\n",b);printf("&b = 0x%0X\n",&b);}/*[[email protected] test_class]# ./a.out *pa = the*(a+1) = the*((int *)(&b +1)-1) = 3*((int *)((&b +1)-1) = 1*((char **)(&a+1)-1) = worldb = 0xBFC556B0&b = 0xBFC556B0*/