[转]位域具体存放数值测试

与位域相关的测试代码

#include <iostream>
#include <windows.h>
using namespace std;
void main()
{
    struct test
    {
        //在这里测试就可以发现其规律，有无unsigned、a:1 a:2 a:4 a:8 a:16 a:32 以及用char的各值来试验就可发现位域的规律
        unsigned int a:8;
    };
    test t1;
    t1.a = 0;
    cout<<"十进制  -> 0:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 0:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 1;
    cout<<"十进制  -> 1:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 1:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 2;
    cout<<"十进制  -> 2:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 2:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 3;
    cout<<"十进制  -> 3:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 3:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 126;
    cout<<"十进制  -> 126:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 126:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 127;
    cout<<"十进制  -> 127:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 127:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 128;
    cout<<"十进制  -> 128:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 128:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 129;
    cout<<"十进制  -> 129:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 129:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 253;
    cout<<"十进制  -> 253:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 253:    "<<hex<<t1.a<<endl;
        cout<<endl;
    t1.a = 254;
    cout<<"十进制  -> 254:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 254:    "<<hex<<t1.a<<endl;
        cout<<endl;
    t1.a = 255;
    cout<<"十进制  -> 255:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 255:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 256;
    cout<<"十进制  -> 256:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 256:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 257;
    cout<<"十进制  -> 257:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 257:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 258;
    cout<<"十进制  -> 258:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 258:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 259;
    cout<<"十进制  -> 259:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 259:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 260;
    cout<<"十进制  -> 260:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 260:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 261;
    cout<<"十进制  -> 261:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 261:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 262;
    cout<<"十进制  -> 262:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 262:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 263;
    cout<<"十进制  -> 263:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 263:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 264;
    cout<<"十进制  -> 264:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 264:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 65533;
    cout<<"十进制  -> 65533:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 65533:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 65534;
    cout<<"十进制  -> 65534:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 65534:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 65535;
    cout<<"十进制  -> 65535:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 65535:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 65536;
    cout<<"十进制  -> 65536:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 65536:    "<<hex<<t1.a<<endl;
    cout<<endl;
    t1.a = 65537;
    cout<<"十进制  -> 65537:    "<<dec<<t1.a<<endl;
    cout<<"十六进制-> 65537:    "<<hex<<t1.a<<endl;
    cout<<endl;
}