Formatting Currency

[Nobody/Anonymous]

I looked through the standard C\C++ libraries for a function to format currency, but I couldn't find one. This is what I have so far:

#########BEGIN CODE
//Output is written to the format buffer (1st parameter);
//the format buffer is returned as a convenience
char* formatCurrency(char* format, double curr)
{

    long dollars = (long)floor(curr);
    long cents = (long)((curr-dollars) * 100);

    //convert longs to strings
    char szDollars[50];

    //we need to be able to change what szCents refers
    //to if we modify it; and we want to do it all on the
    //stack
    char szAlloc[50];
    char* szCents = szAlloc; //still on the STACK
   
    _ltoa(dollars, szDollars, 10);
    _ltoa(cents, szCents, 10);

    //possibly preppend a "0" to the cents string
    if(cents < 10) //there would be no zero at end
    {
        char* oldCents = szCents;
       
        //allocate some more char[] space on the stack
        char szAlloc[50];
        szCents = szAlloc; //a new array

        sprintf(szCents, "0%s", oldCents);
    }

    strcpy(format, "");
    //format the string to a dollar format ($#0.00);
    sprintf(format, "$%s.%s", szDollars, szCents );

    return format;
}

#########END CODE

This code compiles and works fine, but it's pretty slow. How can I make this more efficient?

[Nobody/Anonymous]

use compiler optimizations

[Nobody/Anonymous]

Change the whole formatCurrency() function to:

sprintf(format "$%.2f", curr);

...and read up on printf formatting...

BlakJak :]

[Nobody/Anonymous]

should be

sprintf(format, "$%.2f", curr);

forgot the comma....

BlakJak :]

[Nobody/Anonymous]

Thanks. I'm not even remotely fluent in sprintf/printf formatting.