Differences

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--- literals [2018/02/10 08:14] – created wolfgangriedmann
+++ literals [2018/08/20 04:05] (current) – wolfgangriedmann
@@ Line 3: / Line 3: @@
 ===== String literals =====
-A string literal is delimited with the double hyphen ''"''.
+A string literal is delimited with the double quotation mark ''"''.
-<code>"This is a string"</code>
+<code visualfoxpro>"This is a string"</code>
-Please note that in the VO dialect a string can also be delimited with the single hyphen '' ' ''.
+Please note that in the VO dialect a string can also be delimited with the quotation mark '' ' ''.
-<code>'This is a string' // valid only in the VO dialect, not in Core or Vulcan</code>
+<code visualfoxpro>'This is a string' // valid only in the VO dialect, not in Core or Vulcan</code>
-If you need to specify special characters or single hyphens in a string, you need an ''escaped'' string, prefixed with ''e'':
+If you need to specify special characters or single quotation marks in a string, you need an ''escaped'' string, prefixed with ''e'':
-<code>e"This is an escaped string with a new line \nand a double \" hyphen"</code>
+<code visualfoxpro>e"This is an escaped string with a new line \nand a double \" quotation mark"</code>
 There are also interpolated strings that can contain variables:
-<code>local cValue := "guys" as string
+<code visualfoxpro>local cValue := "guys" as string
-Console.WriteLine( i"Hi {cValue}" )</code>
+Console.WriteLine( i"Hi {cValue}" ) // Hi guys</code>
+Since in the VO dialect a string can also be defined with single quotation marks, there is no possibility for the compiler to see a difference between a single character string and a char. Therefore you should prefix a char literal with a ''c'' like this:
+<code visualfoxpro>cChar := c'\r'</code>
 For more details please see [[strings|Strings and their prefixes]] and [[string_char_byte|String, Char and Byte]]
@@ Line 17: / Line 20: @@
 ===== Numeric literals =====
-As default, every number with decimals is treated as ''Double'' datatype, and every number without decimals as ''Int32'' datatype.
+As default, every number with decimals is treated as ''Double'' datatype, and every number without decimals as ''Int32'' datatype. Values that are too large to fit in a Int32 are seen as Int64.
 If you need to specify what type a numeric literal should take, use suffixes:
   * ''d'' for **D**ouble
-  * ''s'' for **S**single
+  * ''s'' for **S**ingle
   * ''m'' for Deci**m**al
   * ''b'' for **B**inary
 You can also use a prefix of ''0x'' to specify a hexadecimal value.
 Sample code:
-<code>Console.WriteLine( "123.45  is a " + (123.45 ):GetType():Name )	// Double
+<code visualfoxpro>Console.WriteLine( "123.45  is a " + (123.45 ):GetType():Name )      // Double
-Console.WriteLine( "123     is a " + (123 ):GetType():Name )		// Int32
+Console.WriteLine( "123     is a " + ( 123 ):GetType():Name )              // Int32
-Console.WriteLine( "123s    is a " + ( 123s ):GetType():Name )		// Single
+Console.WriteLine( "10000000000 is a " + ( 10000000000 ):GetType():Name )  // Int64
-Console.WriteLine( "123d    is a " + ( 123d ):GetType():Name )		// Double
+Console.WriteLine( "123s    is a " + ( 123s ):GetType():Name )             // Single
-Console.WriteLine( "123dm   is a " + ( 123m ):GetType():Name )		// Decimal
+Console.WriteLine( "123d    is a " + ( 123d ):GetType():Name )             // Double
-Console.WriteLine( "0x111   has a decimal value of " + 0x111:ToString() )	// decimal 273
+Console.WriteLine( "123dm   is a " + ( 123m ):GetType():Name )             // Decimal
-Console.WriteLine( "0b111   has a decimal value of " + 0b111:ToString() )	// decimal 7</code>
+Console.WriteLine( "0x111   has a decimal value of " + 0x111:ToString() )  // decimal 273
+Console.WriteLine( "0b111   has a decimal value of " + 0b111:ToString() )  // decimal 7</code>
+For explanations why these suffixes differ from these on C#, please see this X# forum post: [[https://www.xsharp.info/forum/public-product/555-correct-syntax-for-floats|Correct syntax for floats]] (look at the 3rd message from Chris Pyrgas)