https://github.com/chamini2/alex-happy-testing

Toy calculators for testing Alex and Happy
https://github.com/chamini2/alex-happy-testing

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Toy calculators for testing Alex and Happy

• Host: GitHub
• URL: https://github.com/chamini2/alex-happy-testing
• Owner: chamini2
• Created: 2015-07-23T02:35:33.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-08-12T03:54:30.000Z (over 9 years ago)
• Last Synced: 2023-05-05T14:02:36.296Z (over 1 year ago)
• Language: Haskell
• Size: 152 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Alex-Happy-testing

Toy calculators for testing Alex and Happy

## *Pure calculator*

**Prefix binary** operations with integers. The possible operations are `+`, `-`, `*` and `/`, an end of line can be commented with `# comment`.

#### Example

    > + 10 5

    15

    > * + 10 5 20

    300

    > * 20 + 10 5       # comments are after `#`

    300

    > / 16 * 6 - 20 4   # equivalent to 16 / ((20 - 4) * 6)

    0

    > / 1 0             # in case of division by zero

    -- división entre cero

    > - 5 * 2           # in case of a parsing error

    -- error de parseo

    >                   # control-D to end the program

**Note:** the "`> `" at the start of every line should be written by the program, not the user.

## *Stateful calculator*

**Infix binary** operations with integers and identifiers. The possible operations are `+`, `-`, `*` and `/`, parenthesis can be used `(` and `)`, an end of line can be commented with `# comment`.

To define a new identifier, use the syntax `let  = `.

#### Example

    > 10 + 5

    15

    > let x = 5         # first time `x` was seen

    -- x creado

    > (10 + x) * 20

    300

    > let x = x + 1     # in case of updating an identifier

    -- x actualizado

    > x

    6

    > 16 / (x * (20 - 4))

    0

    > x / 0

    -- división entre cero

    > - 5 * 2

    -- error de parseo

    >

**Note:** the "`> `" at the start of every line should be written by the program, not the user.