Rename Go+ with XGo (#83)

* Rename Go+ with XGo

* Update for/<- to for/in

Author: nighca

101-Hello-world/hello-11.gop

@@ -1,4 +1,4 @@
-// There are three ways to write Go+'s Hello world.
+// There are three ways to write XGo's Hello world.
 
 # The first type: command style
 

101-Hello-world/hello-3.gop

@@ -12,12 +12,12 @@ func main() {
 // starting to allow you to establish some basic logic for functional decomposition and team
 // collaboration.
 
-// So, how do you try to play Go+?
+// So, how do you try to play XGo?
 
-// The simplest, go directly to Go+ Playground to play:
+// The simplest, go directly to XGo Playground to play:
 
-// * https://play.goplus.org/
+// * https://play.xgo.dev
 
 // When learning basic grammar in the early days, it can actually be done in this way.
 
-// How to install Go+ to play locally? We will talk about this topic later.
+// How to install XGo to play locally? We will talk about this topic later.

102-Values/values.gop

@@ -1,10 +1,10 @@
-// Go+ has various value types including strings,
+// XGo has various value types including strings,
 // integers, floats, booleans, etc.
 
 // Here are a few basic examples.
 
 // Strings, which can be added together with `+`.
-println "Go"+"Plus"
+println "X"+"Go"
 
 // Integers and floats.
 println "1+1 =", 1+1

103-Constants/constants.gop

@@ -1,4 +1,4 @@
-// Go+ supports _constants_ of character, string, boolean,
+// XGo supports _constants_ of character, string, boolean,
 // and numeric values.
 
 import (

104-Variables/vars.gop

@@ -1,4 +1,4 @@
-// In Go+, _variables_ are explicitly declared and used by
+// In XGo, _variables_ are explicitly declared and used by
 // the compiler to e.g. check type-correctness of function
 // calls.
 
@@ -11,7 +11,7 @@ println a
 var b, c int = 1, 2
 println b, c
 
-// Go+ will infer the type of initialized variables.
+// XGo will infer the type of initialized variables.
 var d = true
 println d
 

105-Assignments/assign-1.gop

@@ -1,6 +1,6 @@
 # assignment
 
-// = is used for assigning.  The values of multiple variables can be changed in one line. In this way, their values can be swapped without an intermediary variable.
+// `=` is used for assigning.  The values of multiple variables can be changed in one line. In this way, their values can be swapped without an intermediary variable.
 var age int
 
 age = 21 // = is used for assigning.

105-Assignments/assign-2.gop

@@ -1,4 +1,4 @@
-# = vs :=
+# `=` vs `:=`
 
 // := is used for declaring and initializing. Multiple variables can be declared and intialized at one line.
 age := 21 // age is declared and initialized to 21

106-Types/types-2.gop

@@ -1,7 +1,7 @@
-# Go+ has built-in support for rational numbers:
+# XGo has built-in support for rational numbers:
 //
 //
-// We introduce rational numbers as primitive Go+ types. We use suffix r to denote rational literals. For example, 1r << 200 means a big int whose value is equal to 2^200.
+// We introduce rational numbers as primitive XGo types. We use suffix r to denote rational literals. For example, 1r << 200 means a big int whose value is equal to 2^200.
 //
 // By default, 1r will have the type of bigint.
 // And 4/5r means the rational constant 4/5. It will have the type of bigrat.

106-Types/types.gop

@@ -1,4 +1,4 @@
-# Go+ primitive types are
+# XGo primitive types are
 // <pre>
 // bool
 // int8    int16   int32   int    int64    int128

107-Integers/integers.gop

@@ -10,13 +10,13 @@
 // For int 20 values can also be expressed in hex (0x14), octal (0o24), and binary notation (0b0010100).
 // uint, there are no uint literals. All literal whole numbers are treated as int values.
 //
-// Go+ also supports writing numbers with _ as separator and also support cast bool to number types.
+// XGo also supports writing numbers with _ as separator and also support cast bool to number types.
 // As example shows
 
-num := 1_000_000 //Go+ support, same as 1000000
+num := 1_000_000 //XGo support, same as 1000000
 println num
 
-println int(true)       //Go+ support cast bool to int
+println int(true)       //XGo support cast bool to int
 println float64(true)   //and to float64
 println complex64(true) //and to complex64, and so on.