= Expr
Expressions calculator
:authors: Celestino Amoroso
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== 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