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。

 1 #include <iostream>
 2 #include <string>
 3 #include <stdio.h>
 4 using namespace std;
 5 
 6 enum word_len{_32bit = 32, _64bit = 64};
 7 enum nuclear_num{one = 1, two = 2, four = 4};
 8 enum Hyper_thread{_true = 1, _false = 0};
 9 
10 class CPU{
11 private:
12     int clock_frequency:29;
13     word_len wl:7;
14     nuclear_num num:3;
15     Hyper_thread hthread:1;
16 public:
17     CPU(){}
18     CPU(int c, word_len wl = _32bit, nuclear_num num = two, Hyper_thread hthread = _false):
19     clock_frequency(c), wl(wl), num(num), hthread(hthread){}
20     ~CPU(){}
21     void show();
22     
23 };
24 void inline CPU::show(){
25     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：";
26     if(hthread == 1) cout<<"是";
27     else cout<<"否";
28     cout<<endl;
29 }
30     
31 int main(){
32     CPU cp(323232,_64bit,four,_true);
33     cp.show();
34     cout<<sizeof(cp);
35     return 0;
36 }