1 #include <stdio.h>
2 int main()
3 {
4 double addr[10] = {12.23,13.412,1251.23,234.4,215.6,62.2,652.3,635.2,63.6,324.6};
5 char *p_char;
6 short *p_short;
7 int *p_int;
8 long *p_long;
9 long long *p_long_long;
10 float *p_float;
11 double *p_double;
12
13 /*
14 p_double = addr; //指针可以更改指向。
15 addr = p_double; //数组是不可更改指向的。
16 数组相当于 指针常量
17 */
18
19
20 printf("sizeof(addr) = %lu\n\n",sizeof(addr));//80
21
22 //指针在６４位机中所占字节数 都是 ８字节，这就是指针为什么这么高效的原因。
23 //指针与数组的区别：１．64位指针所占字节数永远，数组所占字节数是他的所有元素的字节数集合
24 printf("sizeof(p_char) = %lu\n",sizeof(p_char));
25 printf("sizeof(p_short) = %lu\n",sizeof(p_short));
26 printf("sizeof(p_int) = %lu\n",sizeof(p_int));
27 printf("sizeof(p_long) = %lu\n",sizeof(p_long));
28 printf("sizeof(p_long_long) = %lu\n\n",sizeof(p_long_long));
29 printf("sizeof(p_float) = %lu\n",sizeof(p_float));
30 printf("sizeof(p_double) = %lu\n",sizeof(p_double));
31
32
33 return 0;
34 }
