嵌套结构体的初始化

#include "stdio.h"
struct China_city
{
    char city1[100];
    char city2[100];
    struct Suzhou_town 
    {
        char town1[100];
        char town2[100];
    }town_name_111;
};
int main()
{
    struct China_city City_name
    ={
        "苏州",
        "Lanzhou",
        .town_name_111.town1 = "hello",
        .town_name_111.town2 = "world"
    };
    printf("city name is %s",City_name.city1);
}

 使用typedef声明结构体后，定义结构体时不要加struct，如果加了，会报错“不允许使用不完整的类型”。