哪为高手提供下10进制与16进制互相转化的C++代码

Answer 1

#include <iostream>
using namespace std;
class Hex
{
private:
void hexone(int a)
{
if(a>0)
hexone(a/16);
if(a>=10)
cout << char(a+55);
else
cout << a ;
}
public:
Hex():num(0){}
void sethex()
{
int a;
cin >> a;
hexone(a);
}
};

int main()
{
Hex test;
test.sethex();
}

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Answer 2

int hex_char_value(char c)
{
if(c >= '0' && c <= '9')
return c - '0';
else if(c >= 'a' && c <= 'f')
return (c - 'a' + 10);
else if(c >= 'A' && c <= 'F')
return (c - 'A' + 10);
assert(0);
return 0;
}
int hex_to_decimal(const char* szHex, int len)
{
int result = 0;
for(int i = 0; i < len; i++)
{
result += (int)pow((float)16, (int)len-i-1) * hex_char_value(szHex[i]);
}
return result;
}