请教网友：#pragma pack(push) #pragma pack(pop)无效

//try 一 try

#pragma back(push)
#pragma pack(2)
struct E
{
    char a;
    short b;
    double c;
    float d;
    char e;
};
#pragma back(pop)

int ECount = sizeof(E);
cout << "E count = " << ECount << endl;  //E count = 18

struct F
{
    char a;
    short b;
    double c;
    float d;
    char e;
};
int FCount = sizeof(F);
cout << "F count = " << FCount << endl;  //F count = 18 应该为24

sizeof 计算结构体大小请参考：https://www.cnblogs.com/azbane/p/11299353.html