mini spec: Operators and punctuation; ebnf: Integer literals

doc/spec-mini.md

@@ -1,7 +1,7 @@
 The Go+ Mini Specification
 =====
 
-Go+ has a recommended best practice syntax set, which we call the Go+ Mini Specification.It is simple but Turing-complete and can elegantly implement any business requirements.
+Go+ has a recommended best practice syntax set, which we call the Go+ Mini Specification. It is simple but Turing-complete and can elegantly implement any business requirements.
 
 ## Notation
 
@@ -134,14 +134,38 @@ continue     for          import       return       var
 
 ### Operators and punctuation
 
-TODO
+The following character sequences represent [operators](#operators) (including [assignment operators](#assignment-statements)) and punctuation:
+
+```
++    &     +=    &=     &&    ==    !=    (    )
+-    |     -=    |=     ||    <     <=    [    ]
+*    ^     *=    ^=     <-    >     >=    {    }
+/    <<    /=    <<=    ++    =     :=    ,    ;
+%    >>    %=    >>=    --    !     ...   .    :
+     &^          &^=          ~
+```
 
 ### Integer literals
 
 An integer literal is a sequence of digits representing an [integer constant](). An optional prefix sets a non-decimal base: 0b or 0B for binary, 0, 0o, or 0O for octal, and 0x or 0X for hexadecimal. A single 0 is considered a decimal zero. In hexadecimal literals, letters a through f and A through F represent values 10 through 15.
 
 For readability, an underscore character _ may appear after a base prefix or between successive digits; such underscores do not change the literal's value.
 
+```go
+int_lit        = decimal_lit | binary_lit | octal_lit | hex_lit .
+decimal_lit    = "0" | ( "1" … "9" ) [ [ "_" ] decimal_digits ] .
+binary_lit     = "0" ( "b" | "B" ) [ "_" ] binary_digits .
+octal_lit      = "0" [ "o" | "O" ] [ "_" ] octal_digits .
+hex_lit        = "0" ( "x" | "X" ) [ "_" ] hex_digits .
+
+decimal_digits = decimal_digit { [ "_" ] decimal_digit } .
+binary_digits  = binary_digit { [ "_" ] binary_digit } .
+octal_digits   = octal_digit { [ "_" ] octal_digit } .
+hex_digits     = hex_digit { [ "_" ] hex_digit } .
+```
+
+For example:
+
 ```go
 42
 4_2