[C++] Why won't this typecast work?

[tyguy]

I'm just trying to learn more about coding -- typecasting in particular, as it seems to be used a lot in C++ coding in general.

So i'm trying to typecast an int into a char for std::cout to print:

[t]http://puu.sh/k5GPh/0646667ac6.png[/t]

As you can see, it just leaves a '?' where '25' should be. Why won't it work?

[Anven11]

If you want to print the numeric value of a signed 8-bit integer you have to do this:

std::cout << +(char)32 << std::endl;

Don't ask me why this works.

[cartman300]

[QUOTE=tyguy;48647559]As you can see, it just leaves a '?' where '25' should be. Why won't it work?[/QUOTE]

It works just fine, you are converting an integer value into a character and printing that. Try the opposite for example, casting 'a' to an integer and printing (and then adding 1 and casting back to char and printing).

[gummiwipfel]

What you are actually printing is the symbol with the ASCII-value 25, which is not a printable character (hence the "?"), so the casting is working correctly.
If you want to convert the 25 to a char* (since 1 char is not enough to hold the two characters in 25), have a look at itoa or at stringstream for amore C++-way.

[octopod]

[QUOTE=Anven11;48647626]If you want to print the numeric value of a signed 8-bit integer you have to do this:

std::cout << +(char)32 << std::endl;

Don't ask me why this works.[/QUOTE]

I find it easier to remember if I know why it works, so I looked it up:

[url]https://isocpp.org/wiki/faq/input-output#print-char-or-ptr-as-number[/url]

[Quarternions]

[QUOTE=gummiwipfel;48647728]What you are actually printing is the symbol with the ASCII-value 25, which is not a printable character (hence the "?"), so the casting is working correctly.
If you want to convert the 25 to a char* (since 1 char is not enough to hold the two characters in 25), have a look at itoa or at stringstream for amore C++-way.[/QUOTE]

In addition here is a ASCII chart to show you what you are trying to print when converting to a char :
[thumb]https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/ASCII-Table-wide.svg/2000px-ASCII-Table-wide.svg.png[/thumb]

[Enternode]

I mean

std::cout << static_cast<wchar_t>(25) << std::endl;

Is this not an option/what you wanted?

Output 25 for me

EDIT:

In fact

std::cout << 25 << std::endl;

Works just fine

[Protocol7]

His cast works just fine, it's just that the ASCII value for 25 does not correlate to a human-readable character.

Understanding ASCII gets you actually pretty far when it comes to C++.

[xerxesbeat]

Since you're starting out programming, I would recommend attempting to implement your own function to reformat a binary number into base 10 (bonus point: any given base up to, say, 36)

[proboardslol]

Non windows user here: wtf is _tmain and _TCHAR

[Dilbert]

[QUOTE=proboardslol;48709004]Non windows user here: wtf is _tmain and _TCHAR[/QUOTE]

[url]https://msdn.microsoft.com/en-us/library/6wd819wh%28v=vs.140%29.aspx[/url]

[backwardspy]

[QUOTE=gummiwipfel;48647728]What you are actually printing is the symbol with the ASCII-value 25, which is not a printable character (hence the "?"), so the casting is working correctly.
If you want to convert the 25 to a char* (since 1 char is not enough to hold the two characters in 25), have a look at itoa or at stringstream for amore C++-way.[/QUOTE]
Or, even better, [url=http://en.cppreference.com/w/cpp/string/basic_string/to_string]std::to_string[/url].