On 9/19/07, Dave Smith <[EMAIL PROTECTED]> wrote:
> So now I'm curious. What is sprintf() doing that is so much faster. I
> mean, it has to parse a format string in addition to doing all the itoa
> magic. Anyone care to shed some light? Is my algorithm flawed by design
> (like most of my code)?
>
> Off to read the sprintf() code...
>
> --Dave
Why not. I'll post my answer just since it came out faster than
sprintf. Well, when I pass in a buffer, rather than allocating it in
the function. Don't know about the speed comparison when allocating.
Not that this answers your question...
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/* This space reserved for comments. */
char * itoa(int num)
{
int tmp = num;
int digits = 0;
while(tmp)
{
tmp/=10;
digits++;
}
if(num < 0)
digits++;
char *res = new char[digits+1];
res[digits--] = 0;
if(num < 0)
{
res[0] = '-';
tmp = num * -1;
}
else
tmp = num;
while(tmp)
{
res[digits--] = '0' + tmp%10;
tmp/=10;
}
return res;
}
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