Merge branch 'main' of ssh://git.portale-stac.it:3022/go-pkg/expr

README.adoc

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+= Expr
+Expressions calculator
+:authors: Celestino Amoroso
+:docinfo: shared
+:encoding: utf-8
+:toc: right
+:toclevels: 4
+//:toc-title: Indice Generale
+:icons: font
+:icon-set: fi
+:numbered:
+//:table-caption: Tabella
+//:figure-caption: Diagramma
+:docinfo1:
+:sectlinks:
+:sectanchors:
+:source-highlighter: rouge
+// :rouge-style: ThankfulEyes
+:rouge-style: gruvbox
+// :rouge-style: colorful
+//:rouge-style: monokay
+
+toc::[]
+
+== Expr
+_Expr_ is a GO package capable of analysing, interpreting and calculating expressions.
+
+=== Data types
+_Expr_ supports numerical, string, relational, and boolean expressions.
+
+==== Numbers
+Numbers can be integers (GO int64) and float (GO float64). In mixed operations involving integers and floats, integers are automatically promoted to floats.
+
+.Arithmetic operators
+[cols="1,2,4,4"]
+|===
+| Symbol    | Operation     | Description               | Examples
+
+| `+` / `-` | _change sign_ | Change the sign of values | `-1` [-1], `-(+2)` [-2]
+
+| `+` | _sum_ | Add two values | `-1 + 2` [1], `4 + 0.5` [4.5]
+
+| `-` | _subtracion_ | Subtract the right value from the left one | `3 - 1` [2], `4 - 0.5` [3.5]
+
+| `*` | _product_ | Multiply two values | `-1 * 2` [-1], `4 * 0.5` [2.0]
+
+|=== 
+
+==== String