jigargc / PosixParser

Calculator Language

Student Information

• Name: Jigar Chhatrala
• Stevens Login: [e-mail]
• Name: Akhil Vandanapu
• Stevens Login: [e-mail]

Project Information

• Public GitHub Repo URL: https://github.com/jigargc/PosixParser

Testing

We thoroughly tested my code by writing doc tests for each function, as well as manually testing edge cases and verifying the correctness of the output.

Known Bugs and Issues

• In some cases of post (Increment and Decrement), the application might not handle incorrect user input gracefully, causing unexpected behavior.

Resolving a Difficult Issue

• We had a difficult time implementing the (++) and (--) operators. I had to do a lot of research to understand how to implement them. I also had to implement a function to check if the item is a var or not, because the (++) and (--) operators can only be used on var.

Implemented Extensions

1. Extension 1: Op-equals

   • New verb: "op-equals" to compare two items.
   • To exercise this new verb, use " == "
   • If the two items are the same, the application will return 1
   • If the two items are not the same, the application will return 0
   • example usage : 1==2 will return 0
   • example usage : 1==1 will return 1
   • example usage : a = 1==2 then a will be 0
   • example usage : a == 1==1 returns 0

2. Extension 2: Relational operations

   • Implemented relational operations ==, <=, >=, !=, <, >, using 1 to mean true and 0 to mean false.
   • To exercise this new verb, use " "
   • example usage : 1 < 2 will return 1
   • example usage : 1 > 2 will return 0
   • example usage : a = 1 < 2 then a will be 1
   • example usage : a < 1 < 2 returns 1
   • example usage : a < 1 > 2 returns 0
   • example usage : a < 1 == 2 returns 0
   • example usage : a < 1 != 2 returns 1
   • example usage : a < 1 <= 2 returns 1

3. Extension 3: Boolean operations

   • Implemented boolean operations &&, ||, !.
   • For the boolean operations, the application will return 1 if the condition is true, and 0 if the condition is false.
   • example usage : 1 && 0 will return 0
   • example usage : 1 && 1 will return 1
   • example usage : 1 || 0 will return 1
   • example usage : 0 || 0 will return 0
   • example usage : !1 will return 0
   • example usage : !0 will return 1
   • example usage : a = 1 && 0 then a will be 0

4. Extension 4: Comments

   • Implemented comments using the # symbol and /* comment */.
   • # symbol is used for single line comments
   • /* comment */ is used for multi line comments
   • example usage : # this is a comment
   • example usage : /* this is a comment */
   • example usage : /* this is a comment /* this is a nested comment */ this is a comment */