unsigned int 转 16进制 的string,该如何解决

#include <iostream>
#include <string>
using namespace std;
char ToHexChar(int n)
{
    return n<10 ? n+'0' : n-10+'A';
}
string foo(unsigned int n)
{
    char t, buff[32]={'0','x', 0};
    int i = 2, j = 2;
    do buff[i++] = ToHexChar(n%16); while (n/=16);
    for (--i; j < i; ++j, --i)
        t = buff[i], buff[i] = buff[j], buff[j] = t;
    return buff;
}

int main()
{
    unsigned int n;
    while (cin >> n) cout << foo(n) << endl;
    return 0;
}

------解决方案--------------------

C/C++ code

// 58965的16进制是0xE655
// 不一定是最佳方法
#include <iostream>
#include <string>

using namespace std;

string IntToHex(unsigned int num)
{
    char *chp;
    char ch, chl, chh;
    string hex("0x");
    chp = (char *)&num;
    int int_size = sizeof(int);

    for (int i=int_size; i>=0; i--)
    {
        ch = *(chp + i);
        chh = (ch & 0xF0) >> 4;
        chl = ch & 0x0F;
        chh = chh>0x09 ? chh+0x37 : chh+0x30;
        chl = chl>0x09 ? chl+0x37 : chl+0x30;
        hex = hex + chh + chl;
    }

    return hex;
}

int main()
{
    unsigned int n;
    cout << "int:";
    cin >> n;
    cout << "hex:" << IntToHex(n) << endl;
    return 0;
}

------解决方案--------------------

C/C++ code

#include <iostream>
using namespace std;

char *DecToHex(char *hex, unsigned int dec) 
{ 
    char ch, *left=hex, *right=hex; 
    do 
    { 
        if ((ch=dec%16)<10) *right++ = ch+'0'; 
        else *right++ = ch+55; 
    }while ((dec>>=4) != 0); 
    *right-- = '\0'; 
    while (left<right) 
    { 
        ch = *left; 
        *left++ = *right; 
        *right-- = ch; 
    } 
    return hex; 
} 

int main()
{
    int dec=58965;
    char hex[30];
    memset(hex,0,30);
    DecToHex(hex,dec);
    cout<<hex<<endl;
    return 0;
}

------解决方案--------------------

引用楼主 chiwa737 的帖子:

我想写个函数 想转换 数字 到字符串， 字符串是 16进制的 大家有没有什么思路


例如：

输入 》58965
输出 》"0x0655"

------解决方案--------------------

C/C++ code

#include <string>
#include <iostream>
#include <strstream>

void unsigned_to_hex(unsigned int value, std::string& hex_string)
{
   std::strstream buffer;
   buffer.setf(std::ios::showbase);
   buffer <<std::hex << value;   
   buffer >> hex_string;
}

int  main()
{
   unsigned int value;
   std::cin >> value;

   std::string hex_string;
   unsigned_to_hex(value, hex_string);
   std::cout << hex_string;

   return 0;

}