二進制字符串轉換為int類型， 十六進制

二進制字符串轉換為int類型

int m=Integer.parseInt(a,2);//將字符串轉化成十進制整形，2表示原串表示的數是二進制
String n=Integer.toBinaryString(m);//將上面那個十進制數轉化為二進制字符串形式

 

C++二進制字符串轉十六進制字符串 十六進制字符串轉二進制字符串

 

//__二進制轉十六進制
std::string BinToHex(const std::string &strBin, bool bIsUpper/* = false*/)
{
 std::string strHex;
 strHex.resize(strBin.size() * 2);
 for (size_t i = 0; i < strBin.size(); i++)
 {
     uint8_t cTemp = strBin[i];
     for (size_t j = 0; j < 2; j++)
     {
         uint8_t cCur = (cTemp & 0x0f);
         if (cCur < 10)
         {
             cCur += '0';
         }
         else
         {
             cCur += ((bIsUpper ? 'A' : 'a') - 10);
         }
         strHex[2 * i + 1 - j] = cCur;
         cTemp >>= 4;
     }
 }

 return strHex;
}

　　

 

//十六進制轉二進制
std::string HexToBin(const std::string &strHex)
{
    if (strHex.size() % 2 != 0)
    {
        return "";
    }
 
    std::string strBin;
    strBin.resize(strHex.size() / 2);
    for (size_t i = 0; i < strBin.size(); i++)
    {
        uint8_t cTemp = 0;
        for (size_t j = 0; j < 2; j++)
        {
            char cCur = strHex[2 * i + j];
            if (cCur >= '0' && cCur <= '9')
            {
                cTemp = (cTemp << 4) + (cCur - '0');
            }
            else if (cCur >= 'a' && cCur <= 'f')
            {
                cTemp = (cTemp << 4) + (cCur - 'a' + 10);
            }
            else if (cCur >= 'A' && cCur <= 'F')
            {
                cTemp = (cTemp << 4) + (cCur - 'A' + 10);
            }
            else
            {
                return "";
            }
        }
        strBin[i] = cTemp;
    }
 
    return strBin;
}

　　

 

來源：

https://blog.csdn.net/weixin_33882452/article/details/92035704

https://www.cnblogs.com/azbane/p/10179742.html