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Beau­tiful Racket / racket school 2019

Day 3

Mission

Imple­ment these language features:

  1. inte­gers (posi­tive and nega­tive)

  2. print expres­sions at the top level

  3. termi­nating semi­colons

  4. line & multi­line comments

  5. skip white­space

Example:

test.rkt
#lang scriptish

-1; // line comment
 10 ;

/* multi
// line
comment */
2;
1
2
3
4
5
6
7
8
9
#lang scriptish

-1; // line comment
 10 ;

/* multi
// line
comment */
2;
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Result:

-1
10
2
1
2
3
-1
10
2
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Optional

  1. What could we put inside a line comment that would provoke a lexing error? How might we fix this?

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