第10天C语言(11):typedef和宏定义区别

#include <stdio.h>
typedef int myInt;
#define Integer int

typedef char * String;
#define MY_STRING char *
// 一般情况下如果要给数据类型起一个名建议用typedef, 不要用define

int main()
{
/*
int num = 10;
printf("num = %i\n",num);

myInt age = 22;
printf("num = %i\n",age);

Integer score = 100;
printf("score = %i\n",score);
*/

/*
char *name = "lyh";
printf("name = %s\n",name);

String name2= "lys";
printf("name2 = %s\n",name2);

MY_STRING name3 = "lyx";
printf("name3 = %s\n",name3);
*/

#warning typedef做的到的 define做不到
String name1,name2,name3;
name1 = "lyh";
name2 = "lys";
printf("name1 = %s, name2 = %s\n",name1,name2);

//  char *name3, name4;     // char *name3; char name4
MY_STRING name3,name4;
name3 = "lyh";
name4 = "lys";
printf("name3 = %s, name4 = %s\n",name3,name4);
return 0;
}