Complete set: Intro to C - Bill Buchanan

2.5 Converting between types
A cast does not involve processing ‐ data is simply interpreted in a different way.
For example if we cast the character ʹ5ʹ to an integer we get the ASCII code for 5
(which is 53).
A conversion usually involves some processing.
2.5.1 Converting to a string
We often need to convert to a string.
2.5.1.1 ToString()
The method ToString() can be used for any object. We may optionally control the
format with a format string.
Examples of ToString on an integer
//No surprises here – it gives "3"
3.ToString();
//The stand currency format is used "£3.00" for the UK
3.ToString("c");
//Uses three digits both sides of the . "003.000"
3.ToString("000.000");
//Daisy chains a string method " 3"
3.ToString().PadLeft(5)
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Intro
2.5.1.2 String.Format()
The Format method of the String class may be used to construct strings with variable
components.
Examples of use:
Examples of String.Format
// {0} is a place holder "3 men went to mow"
String.Format("{0} men went to mow.",3)
//"The time is now 23/06/04 12:30"
String.Format("The time now is {0}.", DateTime.Now)
//The place holder {1} crops up with different formats
String.Format("I paid {0:c} on {1:%d} of {1:%MMM}.",
3,DateTime.Now));
In a string format {0} indicates the first parameter, {1} is the next…
Following this indicator we can specify the format to be used after a :
In the example above :c indicates currency ‐ £3.00.
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