一维数组
整型数组
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（单个字符初始化）
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(&a
[0]+1));
char arr
[] = {'a', 'b', 'c', 'd', 'e', 'f'};
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(&a
[0]+1));
字符数组（字符串初始化）
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(&a
[0]+1));
char arr
[] = "abcdef";
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(&a
[0]+1));
字符数组（字符指针初始化）
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));
char * p
= "abcdef";
printf("%d\n", strlen(p
));
printf("%d\n", strelen(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]);
总结：
sizeof求字符个数，包括字符串结束标志'\0'strlen求字符串长度，以'\0'为结束标志，返回'\0'前字符串的长度数组名的意义： ①sizeof(数组名)：这里的数组名表示整个数组，计算的是整个数组的大小 ②&(数组名),这里的数组名表示整个数组，取出的是整个数组的地址 ③除上述两种情况之外，所有的数组名都表示数组首元素的地址
