# Programming Gambas from Zip/Operators

## Operators

### Arithmetic

http://Gambaswiki.org/wiki/lang/arithop by example:

 - 6 x = - x Unary minus Changes number to a negative 5 / 2 = 2.5 Divide 3 + 2 = 5 Add 3 ^ 2 = 9 Power of 7 – 4 = 3 Subtract 13 \ 2 = 6 13 DIV 2 = 6 Integer division 5 * 2 = 10 Multiply 12 % 7 = 5 12 MOD 7 = 5 Remainder after dividing

### Boolean

 Two things combined, or one thing operated on Overall Value Examples SomethingTrue AND SomethingTrue True (1=1) AND (2=2) is TRUE (1<2) AND (5>4) is TRUE Both have to be true to make the whole thing true. SomethingTrue AND SomethingFalse False (1=1) AND (2=3) is FALSE (6>5) AND (4<3) is FALSE SomethingFalse AND SomethingTrue False (5=6) AND (4=4) is FALSE SomethingFalse AND SomethingFalse False (5=6) AND (2=3) is FALSE NOT SomethingTrue False NOT (8=8) is FALSE NOT (1 > -1) is FALSE “Not” means “the opposite of” NOT SomethingFalse True NOT (1=2) is TRUE NOT ("apple" > "banana") is TRUE i.e., the reverse of (a comes after b) SomethingTrue OR SomethingTrue True (1=1) OR (2=2) is TRUE Either one being true will make the whole thing true. SomethingTrue OR SomethingFalse True (1=1) OR (2=3) is TRUE SomethingFalse OR SomethingTrue True (7=3) OR (3=3) is TRUE SomethingFalse OR SomethingFalse False (1=1) OR (2=3) is FALSE SomethingTrue XOR SomethingTrue False (1=1) XOR (4=4) is FALSE SomethingTrue XOR SomethingFalse True (1=1) XOR (4=5) is TRUE SomethingFalse XOR SomethingTrue True (1=5) XOR (4=4) is TRUE SomethingFalse XOR SomethingFalse False (1=2) XOR (4=5) is FALSE

AND = both

OR = either

XOR = either, but not both (“exclusive OR”)

### String Operators

 Joining (Concatenation) String & String Concatenates two strings. String &/ String Concatenate two strings that contain file names. Add a path separator between the two strings if necessary. An example of a path is /home/gerard/Documents/Gambas/ How to get it: User.Home &/ "Documents" &/ "Gambas/" Comparison String = String Returns if two strings are equal. String == String Case-insensitive comparison Returns if two strings are equal, regardless of upper or lower case String LIKE String Checks if a string matches a pattern. Is the first string like the second? There are special codes for the pattern string. Refer to the wiki for more codes, http://Gambaswiki.org/wiki/lang/like * means any character or string of characters "Gambas" Like "G*" means “Does Gambas begin with a G?” ? means any single character; [ ] means either/or the things in brackets: "Gambas" Like "?[Aa]*" means “Does Gambas have a capital or small A as its second letter?” "Gambas" Like "G[^Aa]*" means “Does Gambas not have a capital or small A as its second letter?” Dim Fruit As String = "pear" Label1.text = Fruit Like "{apple,pear,lemon}" shows True, but Label1.text = Fruit Like "{apple, pear, lemon}" shows False because spaces matter. String MATCH String Checks if a string matches a PCRE regular expression. Refer to http://Gambaswiki.org/wiki/doc/pcre PCRE means Perl Compatible Regular Expressions Regular expressions are the ultimate in finding things in strings. String BEGINS String Checks if a string begins a certain way "Gerard" Begins "G" means “Does Gerard begin with a G?” String ENDS String Checks if a string ends a certain way "Benôit" Ends "t" means “Does Benôit end with a t?” String <> String Does not equal, or “is not the same as” String1 < String2 Does string1 come alphabetically before string2? String1 > String2 Does string1 come alphabetically after string2? String1 <= String2 Does string1 come alphabetically before, or is it the same as, string2? String1 >= String2 Does string1 come alphabetically after, or is it the same as, string2?
 Programming Gambas from Zip ← Constants Operators DataTypes →