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format中山高校括号的进入方法

日期:2019-06-12编辑作者:韦德国际1946官方网站
stringValue = 'String formatting'

print 'Fifteen and five characters allowed in string:'

print '(%.15s) (%.5s)' % ( stringValue, stringValue )

String formatting in C#

 

I couldn't find a quick reference to .NET string formatting using the String.Format() function, so I created this one.

When I started working with the .NET framework, one thing puzzled me. I couldn't find sprintf(). sprintf() is the C function that takes an output buffer, a format string, and any number of arguments, and builds a string for you. For example:

format中山高校括号的进入方法。char szError[256]韦德国际1946官方网站,;
sprintf(szError, "Error %d occurred.n", nError);

This would write "Error 12 occurred." into the szError buffer (assuming nError was 12). It's a basic part of C programming and most C programmers still use it though better functionality is available in the STL because sprintf is simple to use and clear. The STL equivalent would be:

str << "Error " << nError << " occurred." << endl;

Or something close to that. It's type-safe, and more OO than sprintf, but not as easy to read and not as easy to localize.

The .NET framework handles strings very nicely - but it takes some getting used to. The rough equivalent of sprintf in .NET is the static String.Format function, which takes a format string and some arguments, and generates an output string. (This is a nice improvement over sprintf since there's no chance you'll overflow the output buffer). For example:

string errorString = String.Format("Error {0} occurred.", nError);

Teeming with metadata, the .NET environment doesn't need the format string to say what type of data you're formatting, just where you want it. (A common sprintf bug is supplying the wrong data type - there's no protection from using %s instead of %d and having your program crash when sprintf is called).

The {0} in the string above is replaced with the value of nError, but what if you want to specify the number of digits to use? Or the base (hexadecimal etc)? The framework supports all this, but where it seemed confusing is that it's not the String.Format function that does the string formatting, but rather the types themselves.

Every object has a method called ToString that returns a string representation of the object. The ToString method can accept a string parameter, which tells the object how to format itself - in the String.Format call, the formatting string is passed after the position, for example, "{0:##}"

The text inside the curly braces is {index[,alignment][:formatString]}. If alignment is positive, the text is right-aligned in a field the given number of spaces; if it's negative, it's left-aligned.

String.format中山大学括号的参加方法,string.format中大

String.Format("{0} world!","hello") //将输出 hello world!,不荒谬,不过如果在率先个参数的即兴地方加上三个大括号:
String.Format("{0} wo{rld!","hello") //就能够产生2个卓殊,分外音讯是:Input string was not in a correct format.
//化解办法:String.Format("{0} wo{{rld!","hello")
//or
String.Format("{0} wo{1}rld!","hello","{")
//它们都将出口 hello wo{rld!

String.Format("{0} world!","hello") //将输出 hello world!,没有失水准,可是假如在率先个参数的任意...

http://blog.csdn.net/a258831020/article/details/46988887

Strings

There really isn't any formatting within a strong, beyond it's alignment. Alignment works for any argument being printed in a String.Format call.

 

Sample Generates
String.Format("->{1,10}<-", "Hello"); -> Hello<-
String.Format("->{1,-10}<-", "Hello"); ->Hello <-

https://aotu.io/notes/2017/11/06/coindozer/

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