What does "1.$" mean?

Question

I'm printing a variable using cout in Visual C++ 2010 and it shows "1.$". What does it mean?

Google does not allow searches with $ so I couldn't find the meaning.

EDIT:

The code is like this:

double func(...);

std::cout << func(...);

I haven't modified cout's defaults

Wanna show the code? Otherwise we could guess you are displaying an amount without decimals, and with a trailing currency code? — Bo Persson, Apr 04 '11 at 17:19
http://stackoverflow.com/questions/936744/are-dollar-signs-allowed-in-identifiers-in-c — beatgammit, Apr 04 '11 at 17:32

score 11 · Accepted Answer · edited May 23 '17 at 11:44

11

Its an infinite value with the precision set small:

#include <iostream>
#include <limits>
int main()
{
    std::cout << std::numeric_limits<double>::infinity() << "\n";
    std::cout << std::numeric_limits<double>::quiet_NaN()() << "\n";

    std::cout << std::setprecision(2) << std::numeric_limits<double>::infinity() << "\n";
    std::cout << std::setprecision(2) << std::numeric_limits<double>::quiet_NaN() << "\n";
}

This should print:

1.#INF
1.#QNAN
1.$
1.$

Edit:

From @ZoogieZork in the comments below (who pointed out that it was a precision problem).
This is directly related to this: What does floating point error -1.#J mean?

edited May 23 '17 at 11:44

Community

1
1

answered Apr 04 '11 at 17:25

Martin York

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@Kirll: Not all systems are conformant. That is why I ask the question. – Martin York Apr 04 '11 at 17:27
[Visual Studio 2010](http://msdn.microsoft.com/en-us/library/6hthw3cb(v=VS.100).aspx) is conformant. – Kirill V. Lyadvinsky Apr 04 '11 at 17:28
@Krill: Are you sure it is not affected by locale or other factors? I ask because I am not sure I am grasping at straws. – Martin York Apr 04 '11 at 17:34
5

I think you've nailed it -- `1.#INF` when "rounded-up" to one decimal place probably ends up as `1.$` since `$` is one character higher than `#`, the same way `1.#INF` ends up as `1.#J` here: http://stackoverflow.com/questions/840081/what-does-floating-point-error-1-j-mean – ZoogieZork Apr 04 '11 at 17:37
And now that I think about it, `1.#QNAN` is probably more likely as to what it really is. – ZoogieZork Apr 04 '11 at 17:44
@ZoogieZork: You were correct. It could be any of the non numerical values. – Martin York Apr 04 '11 at 17:46
@Martin, I hadn't thought about locale, probably you are right. – Kirill V. Lyadvinsky Apr 04 '11 at 17:50

score -2 · Answer 2 · answered Apr 04 '11 at 17:25

-2

$ has no special meaning in C++.

You are printing a string that contains $.

answered Apr 04 '11 at 17:25

Steve Wellens

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The function returns a double! – Martin York Apr 04 '11 at 17:33
A previous poster has suggested that it is returning the ascii equivalent of the dollar sign (0x24). If so, the value is being converted to a string....which contains dollar sign. – Steve Wellens Apr 04 '11 at 18:51

What does "1.$" mean?

2 Answers2

Edit:

Linked