C经典 结构图初始化三种方式

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, const char * argv[])
{

//1
struct Student{
int age;
int grade;
char name[21];
}stu;

stu.age = 20;
stu.grade = 3;
strcpy(stu.name, "占上风");

printf("%s\n",stu.name);
printf("%ld\n",sizeof(stu.name));//=21,值得是空间
// utf-8 一个汉字占三个字节
printf("%ld\n",strlen(stu.name));//=9

printf("\n\n");
//-2----------
struct Student stu2 = {22,3,"lishi"};
printf("%s\n",stu2.name);
printf("%ld\n",sizeof(stu2.name));//=21,值得是空间
//
printf("%ld\n",strlen(stu2.name)); // 5
printf("\n\n");

//-3----
struct Student stu3 ={.name = "gogo"};
printf("%s\n",stu3.name);
return 0;
}