4-19

编写一个名为CPU的类,描述一个CPU 的以下信息:时钟频率,最大不会超过3000MHz;字长,可以是32位或64位;核数,可以是单核,双核或四核;是否支持超线程。各项信息要求使用位域来表示。通过输出sizeof(CPU)来观察该类所占的字节数。

#include <iostream>
#include <string>
#include <stdio.h>
using namespace std;

enum word_len{_32bit = 32, _64bit = 64};
enum nuclear_num{one = 1, two = 2, four = 4};
enum Hyper_thread{_true = 1, _false = 0};

class CPU{
private:
    int clock_frequency:29;
    word_len wl:7;
    nuclear_num num:3;
    Hyper_thread hthread:1;
public:
    CPU(){}
    CPU(int c, word_len wl = _32bit, nuclear_num num = two, Hyper_thread hthread = _false):
    clock_frequency(c), wl(wl), num(num), hthread(hthread){}
    ~CPU(){}
    void show();
    
};
void inline CPU::show(){
    cout<<"时钟频率："<<clock_frequency<<"HZ"<<endl<<"字长："<<wl<<"位"<<endl<<"核数："<<num<<"核"<<endl<<"是否支持超线程：";
    if(hthread == 1) cout<<"是";
    else cout<<"否";
    cout<<endl;
}
    
int main(){
    CPU cp(323232,_64bit,four,_true);
    cp.show();
    cout<<sizeof(cp);
    return 0;
}