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FormatE() with 0.0 [message #60065]

Tue, 01 August 2023 08:35

koldo
Messages: 3358
Registered: August 2008

Senior Veteran

Hi to all

When using FormatE() with a 0, the function seems to avoid considering some formatting flags, like FD_CAP_E and FD_MINIMAL_EXP.
An example:

Cout() << FormatE(0.0,  2, FD_CAP_E | FD_EXP | FD_MINIMAL_EXP); // 0.00e+00
Cout() << FormatE(1234, 2, FD_CAP_E | FD_EXP | FD_MINIMAL_EXP); // 1.23E3

In CvFlt.cpp, line 292, FormatE() function does this (the comments are added):

char *FormatE(char *t, double x, int precision, dword flags)
{
	...
	if(!x) {	// Value is zero
		*t++ = '0';
		if(precision) {
			do_point(t, flags);
			tCat(t, '0', precision);
		}
		tCat(t, "e+00", 4);	// The "e+00" is forced
	}
	...

Best regards
Iñaki

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