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COMS 4115

COMS 4115. Programming Languages &Translators Fall 2008 Prof. Stephen Edwards Mentor – Nalini Vasudevan. [K]AML : Array Manipulation Language. Kaori Fukuoka Ankush Goel Maninder Singh Mayur Lodha. Motivation. Array is a fundamental data structure Wide range of applications

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COMS 4115

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  1. COMS 4115 Programming Languages &Translators Fall 2008 Prof. Stephen Edwards Mentor – Nalini Vasudevan

  2. [K]AML :Array Manipulation Language Kaori Fukuoka Ankush Goel Maninder Singh Mayur Lodha

  3. Motivation • Array is a fundamental data structure • Wide range of applications • Array manipulation an error prone part of algorithms • APL has complicated mathematical form and character set

  4. Overview • Expressive and concise Array Manipulation language • Rich set of operations on Arrays • Treats array as a primitive data type • Consistent structure

  5. Features • Data types • Unlimited size Arrays • Padding elements of Array • Dynamic length Arrays • Selection on demand

  6. Features • Operators • Control flow • Userdefined functions • Output

  7. Hello World program show(“Hello World !!!”);

  8. Array Declaration and Padding • [ ]a = {1,2,3,4,5,6,7,8,9,10}; • [ ][2]b = { {1,2}, {3,4}, {5}, {6} }; [ ][2]b = { {1,2}, {3,4}, {5,0}, {6,0} }

  9. Array Selection • [ ]a = {1,2,3,4,5,6,7,8,9,10}; • [ ]b = [0,3..6,8,9]a;[ ]b = {1,4,5,6,7,9,10};

  10. for Loop [ ]b = {1,4,5,6,7,9,10}; for (i = 0; i<#[ ]b; i++) { show( [i ]b , ” :: ”); } 1 :: 4 :: 5 :: 6 :: 7 :: 9 :: 10

  11. Conditional Statement ? (a > b) { show(“ a is greater than b”); } ! { show(“b is greater than a”); }

  12. Set Operations : Union • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [ ][2]b = { {5,6}, {7,8}, {9}, {10} }; • [ ][2]c = %+([ ][ ]a, [ ][ ]b); [ ][2]c = { {1,2}, {3,4}, {5,6}, {7,8}, {9,0}, {10,0} };

  13. Set Operations : Intersection • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [ ][2]b = { {5,6}, {7,8}, {9}, {10} }; • [ ][2]c = %=([ ][ ]a, [ ][ ]b); [ ][2]c = { {5,6} };

  14. Set Operations : Difference • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [ ][2]b = { {5,6}, {7,8}, {9}, {10} }; • [ ][2]c = %-([ ][ ]a, [ ][ ]b);[ ][2]c = { {1,2}, {3,4} };

  15. Reverse Array • [ ][2]b = { {5,6}, {7,8}, {9}, {10} }; • [ ][2]c = - [ ] [ ]b; [ ][2]c = { {10,0}, {9,0}, {7,8}, {5,6} };

  16. Copy Array • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [ ][2]b = [0,1][ ]a; [ ][2]b = { {1,2}, {3,4} };

  17. Size of Array • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • #[ ][ ]a returns 6. • #[ ]a returns 3.

  18. Sum Array • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • +[ ][ ]a returns 21. • +[0][ ]a returns 3. • +[ ][0]a returns 12.

  19. Concatenate Array • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [ ][2]b = { {5,6}, {7,8}, {9}, {10} }; • [ ][ ]a ++ [ ][ ]b; [ ][2]a = { {1,2}, {3,4}, {5,6}, {5,6}, {7,8}, {9,0}, {10,0} };

  20. Array Access • [ ][2]a = { {1,2}, {3,4}, {5,6} }; • [0][0]a returns 1. • [0][1]a returns 2.

  21. Insert into Array • [ ][2]b = { {1,2}, {3,4}, {5,6} }; • [ ][2]b <- { 7,8,9 }; [ ][ ]b = { {1,2}, {3,4}, {5,6}, {7,8}, {9,0} }

  22. Delete from Array • [ ][2]b = { {1,2}, {3,4}, {5,6} }; • [ ][ ]b -> 1; [ ][ ]b = { {3,4}, {5,6} }

  23. User defined Functions function add(a,b) { return a+b; }

  24. .kaml file Lexer Tokens Parser AST Exception Handling Symbol Table Interpreter Function Table Output Architecture

  25. Sample Program : Transpose [][]x for(i=0;i<#[]x;i++) { []temp = [i][]x; [][i]y = []temp; }

  26. Sample Program : Stack • push(c)[]b <- {c}; • pop() []b -> #[]b;

  27. Lessons Learned • Technical Aspects • Code Organization • Time management • Teamwork

  28. Future Enhancements • Multi Dimensional Array • More Data Types

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