C语言结构体赋值相关
看UNPv1的时候，在第四章看到ipv6结构体的赋值，里面说到C语言的结构体变量无法直接赋值为该结构的常值结构，但是可以用变量赋值，并且如果是初始化的时候也是可以的，废话少说，还是上代码说的明白：
typedef struct A {
int a;
char b;
} A;
int main()
{
A b = {2, 'b'}; //OK
A a = {1, 'a'}; //OK
/* a = {1, 'b'} //非法，结构体赋值不能用常量结构赋值，不过可以这样： */
a = b; /* 合法，b是同类型的结构体变量 */
return 0;
}
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