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[30])
{
    printf("%s", res);
    int result = 0;
    int len = strlen(res);
    //从最高位开始依次计算
    for (int i = 0; i < len; i++)
    {
        result += (res[i] - '0') * pow(2.0, len - i - 1);
    }

    return result;
}
//从8进制转到10进制
int from_8to10(char res[30])
{
    int result = 0;
    int len = strlen(res);
    //从最高位开始依次计算
    for (int i = 0; i < len; i++)
    {
        result += (res[i] - '0') * pow(8.0, len - i - 1);
    }

    return result;
}
//从16进制转到10进制
int from_16to10(char res[30])
{
    int result = 0;
    int len = strlen(res);
    //从最高位开始依次计算
    for (int i = 0; i < len; i++)
    {
        if (res[i] - '0' < 10)
        {
            result += (res[i] - '0') * pow(16.0, len - i - 1);
        }
        else
        {
            result += (10 + res[i] - 'A') * pow(16.0, len - i - 1);
        }
    }

    return result;
}
//10进制转到2进制
void to2(int num, char res[30], int i)
{
    if (num == 0)
    {
        return;
    }
    else
    {
        res[i] = '0' + num % 2;
        to2(num / 2, res, i + 1);
    }
}
//10进制转到8进制
void to8(int num, char res[30], int i)
{
    if (num == 0)
    {
        return;
    }
    else
    {
        res[i] = '0' + num % 8;
        to8(num / 8, res, i + 1);
    }
}
//10进制转到16进制
void to16(int num, char res[30], int i)
{
    if (num == 0)
    {
        return;
    }
    else
    {
        if (num % 16 >= 0 && num % 16 <= 9)
        {
            res[i] = '0' + num % 16;
        }
        else
        {
            res[i] = 'A' + num % 16 - 10;
        }

        to16(num / 16, res, i + 1);
    }
}