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//return the length of result string. support only 10 radix for easy use and better performance
int my_itoa(int val, char* buf)
{
const int radix = 10;
char* p;
int a; //every digit
int len;
char* b; //start of the digit char
char temp;
p = buf;
if (val < 0)
{
*p++ = '-';
val = 0 - val;
}
b = p;
do
{
a = val % radix;
val /= radix;
*p++ = a + '0';
} while (val > 0);
len = (int)(p - buf);
*p-- = 0;
//swap
do
{
temp = *p;
*p = *b;
*b = temp;
--p;
++b;
} while (b < p);
return len;
}
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