double rate[] = {1.12, 1.22};
const double locked[] = {2.45, 55.3};
const double *pc = rate; /*可以*/
pc = locked; /*可以*/

const double locked[] = {2.45, 55.3};
double *pc = locked; /*不可以*/

/*
* 1、STR1、STR2、str5都指向了同一个字符串地址；
* 2、str3数组有自己单独的地址空间；
* 3、str4数组在运行时为其分配空间并赋值，是静态存储区字符串的副本；
* 4、格式化输入输出相同的字符串也只有一份；
*/
#include <stdio.h>
#define STR1 "I am a student."
#define STR2 "I am a student."
char str3[] = "I am a student.";
int main(void)
{
    char str4[] = "I am a student.";
    const char *str5 = "I am a student."; 

    printf("%p\n", STR1);
    printf("%p\n", STR2);
    printf("%p\n", str3);
    printf("%p\n", str4);
    printf("%p\n", str5);

    printf("the string size is:%u\n", sizeof(STR1));
    printf("the string size is:%u\n", sizeof(STR2));
    printf("the string size is:%d\n", sizeof(STR1));
    return 0;
}
输出结果：
0x1055c
0x1055c
0x21028
0x7eaeb1b4
0x1055c
the string size is:16
the string size is:16
the string size is:16

/* 部分数据段汇编代码 */
str3:
    .ascii  "I am a student.\000"
    .section        .rodata
    .align  2
.LC0:
    .ascii  "I am a student.\000"
    .align  2
.LC1:
    .ascii  "%p\012\000"
    .align  2
.LC2:
    .ascii  "the string size is:%u\012\000"
    .align  2
.LC3:
    .ascii  "the string size is:%d\012\000"