這幾天需要把一個int型整數轉換成指定進制的字符串,在windows下通過itoa實現了這個需求,然後發現在linux下沒有這個函數,然後網上都說可以通過sprintf等來實現轉換,但是還是不能實現itoa的任意進制轉換功能,想看一下itoa的源代碼吧,也搜不到,只好參考別人的寫法,自己實現了一下這個函數......
void itos_upper(int iValue, string &strDst, unsigned int uRadix)
{
if (uRadix > 36 || uRadix < 2) return;
static char szTemp[33];
char *p = &szTemp[32];
*p = '\0';
bool bMinus = false;
unsigned int uValue = (unsigned int)iValue;
if (uRadix == 10 && iValue < 0)
{
uValue = (unsigned int)-iValue;
bMinus = true;
}
do
{
*--p = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[uValue % uRadix];
uValue /= uRadix;
} while (uValue);
if (bMinus)
*--p = '-';
strDst = p;
}
void itos_lower(int iValue, string &strDst, unsigned int uRadix)
{
if (uRadix > 36 || uRadix < 2) return;
static char szTemp[33];
char *p = &szTemp[32];
*p = '\0';
bool bMinus = false;
unsigned int uValue = (unsigned int)iValue;
if (uRadix == 10 && iValue < 0)
{
uValue = (unsigned int)-iValue;
bMinus = true;
}
do
{
*--p = "0123456789abcdefghijklmnopqrstuvwxyz"[uValue % uRadix];
uValue /= uRadix;
} while (uValue);
if (bMinus)
*--p = '-';
strDst = p;
}