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16进制转2进制.cpp
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16进制转2进制.cpp
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#include<iostream>
#include<cstdlib>
#include<stdio.h>
using namespace std;
int main()
{
char a[256],count=0,i,j;
int bin[256][4];
cout<<"请输入16进制的数：";
cin>>a;
for(i=0;a[i]!='\0';i++)
{
switch(a[i])
{
case'0':
bin[i][0]=0;
bin[i][1]=0;
bin[i][2]=0;
bin[i][3]=0;
break;
case'1':
bin[i][0]=0;
bin[i][1]=0;
bin[i][2]=0;
bin[i][3]=1;
break;
case '2':
bin[i][0]=0;
bin[i][1]=0;
bin[i][2]=1;
bin[i][3]=0;
break;
case '3':
bin[i][0]=0;
bin[i][1]=0;
bin[i][2]=1;
bin[i][3]=1;
break;
case '4':
bin[i][0]=0;
bin[i][1]=1;
bin[i][2]=0;
bin[i][3]=0;
break;
case '5':
bin[i][0]=0;
bin[i][1]=1;
bin[i][2]=0;
bin[i][3]=1;
break;
case '6':
bin[i][0]=0;
bin[i][1]=1;
bin[i][2]=1;
bin[i][3]=0;
break;
case '7':
bin[i][0]=0;
bin[i][1]=1;
bin[i][2]=1;
bin[i][3]=1;
break;
case '8':
bin[i][0]=1;
bin[i][1]=0;
bin[i][2]=0;
bin[i][3]=0;
break;
case '9':
bin[i][0]=1;
bin[i][1]=0;
bin[i][2]=0;
bin[i][3]=1;
break;
case 'A':
bin[i][0]=1;
bin[i][1]=0;
bin[i][2]=1;
bin[i][3]=0;
break;
case 'B':
bin[i][0]=1;
bin[i][1]=0;
bin[i][2]=1;
bin[i][3]=1;
break;
case 'C':
bin[i][0]=1;
bin[i][1]=1;
bin[i][2]=0;
bin[i][3]=0;
break;
case 'D':
bin[i][0]=1;
bin[i][1]=1;
bin[i][2]=0;
bin[i][3]=1;
break;
case 'E':
bin[i][0]=1;
bin[i][1]=1;
bin[i][2]=1;
bin[i][3]=0;
break;
case 'F':
bin[i][0]=1;
bin[i][1]=1;
bin[i][2]=1;
bin[i][3]=1;
break;
default:
exit(-1);
}
count++;
}
cout<<"16进制转换为二进制是";
for(i=0;i<count;i++)
{
for(j=0;j<4;j++)
{
cout<<bin[i][j];
}
}
system("PAUSE");
return 0;
}