Fast Binary to Decimal code

Rammy,

Have you tried the standard C library itoa() function?

I have not compared its speed with other methods, but that would be a good place to start.

How many decimal digits do you need, and what size of binary input do you need?  (32-bit, 64-bit, etc)

Steve

Thanks for your reply

I'd like to convert a 16 bit binary number to a decimal number ,i'll use this code with ccs  v4.2.1.

I think that ccs doesn't have the itoa fn.

Thanks alot

Ramy,

You can pass this routine a 16-bit signed int, and the compiler will type cast it up to a 32-bit int.

char  *itoa(int value, char *dest_p)
{

    char      buffer[20];
    char     *p;
    int        x, y, n;

    x = value;
    if (value < 0)
        x = -x;

    buffer[19] = 0;
    p = &buffer[18];

    n = 1;
    do
      {
        y = x % 10;   // Modulo 10 to get next digit
        x /= 10;
        *p-- = (char) (y + 0x30);  // Convert to ASCII char
        n++;   // Count the digits produced
      }
    while (x);  // Repeat until x goes to zero

    if (value < 0)  // If the input was negative ...
      {
        *p-- = '-';  // Add a minus sign to the string
        n++;
      }

    // Copy string to destination area
    memcpy(dest_p, p + 1, n);

    return dest_p;

}

Ramy,

Ooops!

x, y, and n should be 'unsigned int' types, to avoid problems when the input value is -2,147,483,648.

Steve