指针练习------详细的图文并茂法来解析-阿里云开发者社区

指针练习------详细的图文并茂法来解析

2023-05-24 65

版权

本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。

本文涉及的产品

公共DNS（含HTTPDNS解析），每月1000万次HTTP解析

云解析 DNS，旗舰版 1个月

全局流量管理 GTM，标准版 1个月

简介： 指针练习------详细的图文并茂法来解析

int main()

{

//一维数组

int a[] = { 1,2,3,4 };

printf("%d\n", sizeof(a));

printf("%d\n", sizeof(a + 0));

printf("%d\n", sizeof(*a));

printf("%d\n", sizeof(a + 1));

printf("%d\n", sizeof(a[1]));

printf("%d\n", sizeof(&a));

printf("%d\n", sizeof(*&a));

printf("%d\n", sizeof(&a + 1));

printf("%d\n", sizeof(&a[0]));

printf("%d\n", sizeof(&a[0] + 1));

//字符数组

char arr[] = { 'a','b','c','d','e','f' };

printf("%d\n", sizeof(arr));

printf("%d\n", sizeof(arr + 0));

printf("%d\n", sizeof(*arr));

printf("%d\n", sizeof(arr[1]));

printf("%d\n", sizeof(&arr));

printf("%d\n", sizeof(&arr + 1));

printf("%d\n", sizeof(&arr[0] + 1));

printf("%d\n", strlen(arr));

printf("%d\n", strlen(arr + 0));

printf("%d\n", strlen(*arr));

printf("%d\n", strlen(arr[1]));

printf("%d\n", strlen(&arr));

printf("%d\n", strlen(&arr + 1));

printf("%d\n", strlen(&arr[0] + 1));

char arr[] = "abcdef";

printf("%d\n", sizeof(arr));

printf("%d\n", sizeof(arr + 0));

printf("%d\n", sizeof(*arr));

printf("%d\n", sizeof(arr[1]));

printf("%d\n", sizeof(&arr));

printf("%d\n", sizeof(&arr + 1));

printf("%d\n", sizeof(&arr[0] + 1));

printf("%d\n", strlen(arr));

printf("%d\n", strlen(arr + 0));

printf("%d\n", strlen(*arr));//error

printf("%d\n", strlen(arr[1]));//error

printf("%d\n", strlen(&arr));

printf("%d\n", strlen(&arr + 1));

printf("%d\n", strlen(&arr[0] + 1));

//指针存常量字符串

char* p = "abcdef";

printf("%d\n", sizeof(p));

printf("%d\n", sizeof(p + 1));

printf("%d\n", sizeof(*p));

printf("%d\n", sizeof(p[0]));

printf("%d\n", sizeof(&p));

printf("%d\n", sizeof(&p + 1));

printf("%d\n", sizeof(&p[0] + 1));

printf("%d\n", strlen(p));

printf("%d\n", strlen(p + 1));

printf("%d\n", strlen(*p));

printf("%d\n", strlen(p[0]));

printf("%d\n", strlen(&p));

printf("%d\n", strlen(&p + 1));

printf("%d\n", strlen(&p[0] + 1));

//二维数组

int a[3][4] = { 0 };

printf("%d\n", sizeof(a));

printf("%d\n", sizeof(a[0][0]));

printf("%d\n", sizeof(a[0]));

printf("%d\n", sizeof(a[0] + 1));

printf("%d\n", sizeof(*(a[0] + 1)));

printf("%d\n", sizeof(a + 1));

printf("%d\n", sizeof(*(a + 1)));

printf("%d\n", sizeof(&a[0] + 1));

printf("%d\n", sizeof(*(&a[0] + 1)));

printf("%d\n", sizeof(*a));

printf("%d\n", sizeof(a[3]));

return 0;

}