How to display ASCII char value for decimal values greater than 127.

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I have tried the following code for using char value of decimal numbers.

C++

int k = 97;
char ch = static_cast<char>(k);

Here in this case ch shows 'a' value(i.e. correct) for k but when I enter value of k greater than 127, it is not displaying expected value. It is showing some other values. May be it is due Non ASCII code (128-255).
Please help me out in this problem.

Posted 11-Jun-13 5:36am

Rahul from Poona

Updated 11-Jun-13 5:39am

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nv3 11-Jun-13 11:56am

Please add your platform and the way you are outputting this character.

lewax00 11-Jun-13 17:35pm

Technically speaking, there are no ASCII characters above 127. ASCII is a 7-bit encoding, only capable of representing 0-127, anything higher requires an eighth bit, which makes it extended ASCII, and is not standard across platforms.

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Jochen Arndt · Accepted Answer · 2013-06-11T06:12:00

Solution 1

When casting an int greater than 127 to a char, the result is not the expected one because the value is truncated. char is a signed type which can hold values from -128 to 127 (see also MSDN[^]).

Depending on your code you may use negative ints or the unsigned char type for non ASCII 8-bit characters.

Posted 11-Jun-13 6:12am

Jochen Arndt

Comments

Sergey Alexandrovich Kryukov 11-Jun-13 13:11pm

Exactly, my 5.
Besides, who needs these so called "extended ASCII" characters or one of those mutually-exclusive encodings using this range? It could be used only for solving some problem with the compatibility with really obsolete legacy. The character which used to be placed in this range are now standardized by Unicode with some different code points.
—SA

pasztorpisti · Accepted Answer · 2013-06-11T11:16:00

I guess your problem can be that the output you use (console or whatever doesn't have the right codepage). Personally my favorite codepage to view binary stuff (to display all 256 characters as distinguishable glyphs) has always been Codepage 437[^] (loved it on the character mode of my old Hercules monitor that could display only cp437). On codepage 437 only chr(0), chr(32) and chr(255) have the same glyph (blank). All other characters are easily distinguishable. Many default codepages/character sets for terminals have no glyphs for non-ascii characters (>127) so they display a placeholder/default char like space, '?' or '.' instead of those chars. Find out how to tweak the console in which you run the program. Unfortunately you may not be able to influence it from your program depending on the platform and console you are using.