CMPT 120 Lecture : Calculations and Functions

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aquamarinelizard550

20 Oct 2011

School

Simon Fraser University

Department

Computing Science

Course

CMPT 120

Professor

Greg Baker

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CMPT 120 Full Course Notes

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Document Summary

Doing calculations: we will need to do some calculations to implement most algorithms, an expression is any kind of calculation that produces a result, numeric expressions produce a number as a result, eg. in guessing game: guess+1. 10 + 2 * 3 => 16 (10 + 2) * 3 => 36 so far, all we can do with the result of an expression is print it: print 18/2 -1. => 8: we will do more with them later, expressions can also be used to create strings, eg. cmpt + 120 => cmpt120 . => try two : a string in python must be in quotes, print hi , single quotes are also okay: Print hi" so, 10 and 10 are different things: 10 is a number (ten, 10 is a strong ( 1 then 0 , eg. => 20 (a number) Functions: an expression can include the evaluation of functions, a function takes some arguments and returns a result.

Related Questions

Complete the following problem using concepts of STACK.
If you are using JAVA, you must include the main method as well which should test your other methods and print the outputs according to the tasks.
If you are using PYTHON, make sure your code has the methods invoked and proper printing statements according to the tasks.
Your program will take an arithmetic expression as a string input. For Example:
- “1+2*(3/4)”
- “1+2*[3*3+{4–5(6(7/8/9)+10)–11+(12*8)]+14”
- “1+2*[3*3+{4–5(6(7/8/9)+10)}–11+(12*8)/{13+13}]+14”
Program

Your program will determine whether the open brackets (the square brackets, curly braces, and the parentheses) are closed in the correct order.

Outputs:

Output 1

1+2*(3/4)

This expression is correct.

Output 2

1+2*[3*3+{4–5(6(7/8/9)+10)–11+(12*8)]+14

This expression is NOT correct.

Error at character # 10. ‘{‘- not closed.

Output 3

1+2*[3*3+{4–5(6(7/8/9)+10)}–11+(12*8)/{13+13}]+14

This expression is correct.

Output 4

1+2]*[3*3+{4–5(6(7/8/9)+10)–11+(12*8)]+14

This expression is NOT correct.

Error at character # 4. ‘]‘- not opened.

Task 1

Solve the above problem using an array-based stack.

Task 2

Solve the above problem using a linked list-based stack.

goldtrout295

• Given that the two legs (i.e. not hypotenuse) of a right triangle have lengths A and B (doubles), write a Java expression to calculate the length of the hypotenuse in terms of A and B. (Remember that if the two legs of a right triangle have length A and B, then the length of the hypotenuse I can be calculated using the formula H2 = A + B2)

I. [10 marks For each row in the table below, determine what would happen if you opened DrScheme and tried to evaluate the given code. If there is an error, brielly explain what is wrong (be more specific than saying "invalid Scheme expression"). If there is no error, give the value produced by DrScheme. The first two rows have been completed for you as examples. Answer Scheme Code (+ 12) (+ 1 2)) (7 + 12) Error. There is an extra) (+ 4 (* 1 (+ 4 2))) ( 1 ((reraircer 27 9) (sqr 5))) (/ 10 (-3 (-14))) (= 'apple 'banana) (and (< 3 4) 19 10)) (- 12 (string-length. "iya")) (reso rest (rest (rest (cors'a (cons 3 (cons 5 empty))))))) (cond [(> 3 8) "happy! [(-34) 'sad) [(even? 9) 'oops] ) (posn-X (first (rest (coris (make-posn 3 4) (cons (make-posr. 56) empty)))))

CMPT 120 Lecture : Calculations and Functions

CMPT 120 Full Course Notes

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