结构体初始化

#include <iostream>

using namespace std;

typedef struct {
    unsigned int i:3;
    unsigned int j:5;
}str1;

typedef struct {
    str1 s1[2];
}str2;

int main()
{
    str2 s2 = {{{5,6},{7,8}}};
    str1 s3[2] = {{1,2},{3,4}};

    cout << s2.s1[1].i << endl;
    cout << s3[1].i << endl;

    return 0;
}

#include <iostream>

using namespace std;

typedef struct {
    unsigned int i:3;
    unsigned int j:5;
}str1;

typedef struct {
    str1 s1[2];
}str2;

int main()
{
    str2 s2 = {5,6,7,8};
    str1 s3[2] = {{1,2},{3,4}};

    cout << s2.s1[1].i << endl;
    cout << s3[1].i << endl;

    return 0;
}


 

 

由外到里的大括号分别是：结构str2，数组(成员s1[2])，结构str1.所以一个也不能少.但是结构定义也可按顺序依次初始化，所以只保留最外层也可，那样就是结构str2的大括号了～