程序代写代做代考 CMPSC-132: Programming and Computation II

CMPSC-132: Programming and Computation II

Fall 2018

Lab #7
Due Date: 10/05/2018, 11:59PM

Instructions:

– The work in this lab must be completed alone and must be your own. Do not copy code
from online sources. That is considered plagiarism.

– Use the starter code provided on this CANVAS assignment. Do not change the function
names or given started code on your script

– The file name must be LAB7.py (incorrect name files will get a -1 point deduction)

– A doctest is provided as an example of code functionality. Getting the same result as
the doctest does not guarantee full credit. You are responsible for testing your code

with enough data as possible.

– Each function must return the output (Do not use print in your final submission otherwise,
you will get a -1 pt deduction)

– Do not include test code outside any function in the upload. Remove all your testing code
before uploading your file. Do not include the input() function in your submission.

Goal

[10 pts] In the starter code, there is a function called triangle that calls the function

recursive_triangle(n,n) once. For this exercise you must write the recursive function

recursive_triangle(x, n) that returns a string with the LAST x lines of a right triangle of base and

height n.

– recursive_triangle(x, n) must be a recursive function, otherwise, no credit is given

– recursive_triangle(x, n) must return the pattern as ‘ ***
**
*’. As shown in the
example, you can use the print method during testing to check if your pattern is correct.

– Don’t modify anything in the triangle function. If your recursive function is correct, calling
triangle(n) should return the complete right triangle.

EXAMPLES:

>>> triangle(4)

‘****
***
**
*’

>>> print(triangle(4))

****

***

**

*

>>> recursive_triangle(2,4)

‘ **
*’

>>> print(recursive_triangle(2,4))

**

*

This is the output that will be

graded, make sure your function

returns the value in this form

You can call the print method on

your function to see the

triangle pattern

>>> triangle(6)

‘******
*****
****
***
**
*’

>>> print(triangle(6))

******

*****

****

***

**

*

>>> recursive_triangle(3,6)

‘ ***
**
*’

>>> print(recursive_triangle(3,6))

***

**

*

Notes:

 Output like ‘ ***
**
*
’ is also valid

 The doctest includes \n instead of
in order to keep consistent leading whitespace

Deliverables:

 Submit your code in a file name LAB7.py to the Lab7 CANVAS assignment before the
due date