C ++无限标志

Question

Hello I was just wondering how I can display the infinity (∞) in C++? I am using CodeBlocks. I read couple of Q&A's on this topic but I'm a newbie at this stuff, especially with Hex coding and stuff. What do I have to include and what do I type out exactly. If someone can write the code and explain it, that'd be great! Thanks!

Answer 1

The symbol is not part of the ASCII code . However, in the code page 437 (most of the time the default in Windows Command Prompt with English locales/US regional settings) it is represented as the character #236. So in principle

std::cout << static_cast<unsigned char>(236);

should display it, but the result depends on the current locale/encoding. On my Mac (OS X) it is not displayed properly.

The best way to go about it is to use the UNICODE set of characters (which standardized a large amount of characters/symbols). In this case,

std::cout << "\u221E"; 

should do the job, as the UNICODE character #221 represents inf .

However, to be able to display UNICODE, your output device should support UTF encoding. On my Mac, the Terminal uses UTF, however Windows Command Prompt still uses the old ASCII encoding CodePage 437 (thanks to @chris for pointing this out). According to this answer , you can change to UNICODE by typing

chcp 65001

in a Command Prompt.

Answer 2

You can show it through its UNICODE

∞ has the value: \∞

You can show any character from the Character Map by its unicode.