本文通过一个简单的C语言程序，探讨了字符串字面量、字符数组和指向字符串的指针在内存中的地址差异。演示了预处理器宏定义的字符串字面量与字符数组和指针在内存中是如何被分配的不同地址。
#define MSG "I'm special."
#include <stdio.h>
int main()
{
char ar[] = MSG;
const char *pt = MSG;
printf("address of \"I'm special\": %p \n", "I'm special");
printf(" address ar: %p %p\n", ar, &ar[0]);
printf(" address pt: %p\n", pt);
printf(" address of MSG: %p\n", MSG);
printf("address of \"I'm special\": %p \n", "I'm special");
return 0;
}
pt and MSG are the same address, while ar is a different address,
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