define和typedef

#include "stdio.h"

//#define string char*	//只能替换,定义string str1 = "hello",str2 = "world",则会报错

typedef char* string;	//给类型起别名,且定义string str1 = "hello",str2 = "world"不会出错

int main(void)
{
	string str1 = "hello",str2 = "world";
	printf("%s\n",str1);
	printf("%s\n",str2);
	return 0;
}