21.MFC进制转换工具

相关代码:链接：https://pan.baidu.com/s/1pKVVUZL 密码：e3vf

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <string.h>
 #include <math.h>

 //从2进制转到10进制
 int from_2to10(char res[])
 {
     printf("%s", res);
     int result = ;
     int len = strlen(res);
     //从最高位开始依次计算
     for (int i = ; i < len; i++)
     {
         result += (res[i] - '') * pow(2.0, len - i - );
     }

     return result;
 }
 //从8进制转到10进制
 int from_8to10(char res[])
 {
     int result = ;
     int len = strlen(res);
     //从最高位开始依次计算
     for (int i = ; i < len; i++)
     {
         result += (res[i] - '') * pow(8.0, len - i - );
     }

     return result;
 }
 //从16进制转到10进制
 int from_16to10(char res[])
 {
     int result = ;
     int len = strlen(res);
     //从最高位开始依次计算
     for (int i = ; i < len; i++)
     {
         if (res[i] - '' < )
         {
             result += (res[i] - '') * pow(16.0, len - i - );
         }
         else
         {
             result += ( + res[i] - 'A') * pow(16.0, len - i - );
         }
     }

     return result;
 }
 //10进制转到2进制
 void to2(int num, char res[], int i)
 {
     if (num == )
     {
         return;
     }
     else
     {
         res[i] = '' + num % ;
         to2(num / , res, i + );
     }
 }
 //10进制转到8进制
 void to8(int num, char res[], int i)
 {
     if (num == )
     {
         return;
     }
     else
     {
         res[i] = '' + num % ;
         to8(num / , res, i + );
     }
 }
 //10进制转到16进制
 void to16(int num, char res[], int i)
 {
     if (num == )
     {
         return;
     }
     else
     {
         if (num %  >=  && num %  <= )
         {
             res[i] = '' + num % ;
         }
         else
         {
             res[i] = 'A' + num %  - ;
         }

         to16(num / , res, i + );
     }
 }