Function UnityPrintFloat

tests/unity/src/unity.c:266–353

This function prints a floating-point value in a format similar to * printf("%.6g"). It can work with either single- or double-precision, * but for simplicity, it prints only 6 significant digits in either case. * Printing more than 6 digits accurately is hard (at least in the single- * precision case) and isn't attempted here. */

 * Printing more than 6 digits accurately is hard (at least in the single-
 * precision case) and isn't attempted here. */
void UnityPrintFloat(const UNITY_DOUBLE input_number)
{
    UNITY_DOUBLE number = input_number;

    /* print minus sign (including for negative zero) */
    if (number < (double)0.0f || (number == (double)0.0f && (double)1.0f / number < (double)0.0f))
    {
        UNITY_OUTPUT_CHAR('-');
        number = -number;
    }

    /* handle zero, NaN, and +/- infinity */
    if (number == (double)0.0f) UnityPrint("0");
    else if (isnan(number)) UnityPrint("nan");
    else if (isinf(number)) UnityPrint("inf");
    else
    {
        int exponent = 0;
        int decimals, digits;
        UNITY_INT32 n;
        char buf[16];

        /* scale up or down by powers of 10 */
        while (number < (double)(100000.0f / 1e6f))  { number *= (double)1e6f; exponent -= 6; }
        while (number < (double)100000.0f)         { number *= (double)10.0f; exponent--; }
        while (number > (double)(1000000.0f * 1e6f)) { number /= (double)1e6f; exponent += 6; }
        while (number > (double)1000000.0f)        { number /= (double)10.0f; exponent++; }

        /* round to nearest integer */
        n = ((UNITY_INT32)(number + number) + 1) / 2;
        if (n > 999999)
        {
            n = 100000;
            exponent++;
        }

        /* determine where to place decimal point */
        decimals = (exponent <= 0 && exponent >= -9) ? -exponent : 5;
        exponent += decimals;

        /* truncate trailing zeroes after decimal point */
        while (decimals > 0 && n % 10 == 0)
        {
            n /= 10;
            decimals--;
        }

        /* build up buffer in reverse order */
        digits = 0;
        while (n != 0 || digits < decimals + 1)
        {
            buf[digits++] = (char)('0' + n % 10);
            n /= 10;
        }
        while (digits > 0)
        {
            if(digits == decimals) UNITY_OUTPUT_CHAR('.');
            UNITY_OUTPUT_CHAR(buf[--digits]);