什么是char s ='2'和char s ='\ 2'之间的区别？ [英] Whats the difference between char s='2' and char s= '\2' ?

问题描述

我找到了字符的ascii值。

char s ='2'和char s ='\ 2'之间的区别是什么？

Ascii Value char ='2'。输出= 50.

Ascii char的值='\ '2'。输出= 2.

什么是\的重要性？



我尝试了什么： < br $>


char s ='\''';

char v ='2';

cout< < int（v）<< endl;

cout<< int（s）<< endl;

返回0;

I am finding the ascii value for characters.
whats the difference between char s='2' and char s= '\2' ?
Ascii Value of char = '2'. Output = 50.
Ascii Value of char = '\2'. Output = 2.
Whats the significance of "\" ?

What I have tried:

char s = '\2';
char v = '2';
cout << int(v) << endl;
cout << int(s) << endl;
return 0;

推荐答案

怎么样'文档'：转义序列 - cppreference.com [ ^ ]？

区别在于第一行中的引用值是对ASCII值的引用2，而第二个引用值是对字符'2'的ASCII代码的引用。



看看这个页面

注意任意八进制值的格式是 \ nnn - 这是您在

The difference is that the quoted value in the first line is a reference to the ASCII value 2 while the second quoted value is a reference to the ASCII code for the character '2'.

Take a look at this page
Note that the format for arbitrary octal value is \nnn - this is format you are using in

char s = '\2';

这意味着你将八进制值2（或002）赋给变量s。



在第二行中，您指定ASCII字符'2'（八进制值） 062，十进制50）到变量v。



我希望有所帮助。

This means that you are assigning the octal value 2 (or 002) to the variable s.

In the second line you are assigning the ASCII character '2' (octal value 062, decimal 50) to the variable v.

I hope that helps.

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