Download COSC 235 - October 29, 2008 Test 2 Solutions - Prof. David A. Sykes and more Exams Computer Science in PDF only on Docsity!
Test 2
Name: ______________________________ Pledged: _________________________________
Answer all questions completely.
1. Indicate for each term ONE example of the concept in the program.
0 function definition
1 formal parameter
2 actual parameter ( argument )
3 function call
4 local variable
5 docstring
6 object construction
7 method call
8 comment
9 module from graphics import * def moveTo(shape, newCenter): "Move the shape to point newCenter"
Get the current center
currCenter = shape.getCenter()
Compute the deltas for x and y
dx = newCenter.getX() - currCenter.getX() dy = newCenter.getY() - currCenter.getY()
Move the shape
shape.move(dx, dy)
Test the function by moving a circle
print "Click once to move the circle, click again to close."
Put a circle at the center of a graphics window
win = GraphWin() circ = Circle(Point(100,100), 25) circ.draw(win)
Move the circle to the point the mouse is clicked
pt = win.getMouse() moveTo(circ, pt) win.getMouse() win.close()
2. Complete the segment to display a line segment in a graphics window. The user clicking
twice in the window determines the endpoints of the line segment.
from graphics import *
Open a graphics window
win = GraphWin("Line Segment", 600, 400)
Wait for 2 mouse clicks and capture the 2 click points, p1 and p
Draw a line segment between p1 and p
Wait for a third click and then close the window
3. Write a function to meet this specification:
negatives(numList) returns the count of the items in numList, that are negative, where
numList is a list of numbers. For example, negatives([-1, 2, - 3, - 4 , 5 ]) is 3.
5. Body mass index (BMI) is sometimes used to determine whether a person is overweight.
An alternative to BMI is waist‐to‐hip ratio (WHR), computed by dividing the waist
measurement by hip measurement. The interpretation is shown in the table.
Male Female Health Risk Based Solely on WHR 0.95 or below 0.80 or below Low Risk 0.96 to 1.0 0.81 to 0.85 Moderate Risk above 1.0 above 0.85 High Risk
Complete the definition of the function WHR() below. Floating point values can be rounded
using the built‐in round() function.^1 Make sure your function returns a integer value and
does not print it. Use as few comparisons as you can.
from math import round def WHR(sex, waist, hips): """Computes the waist-to-hip ratio and returns an integer value that interprets the ratio: - 1 indicates low risk, 0 indicates moderate risk, and 1 indicates high risk. sex is either 'M' or 'F', indicating male or female. For example, WHR('M', 32, 36) returns - 1 (since the ratio is 0.89).""" (^1) round( x, n)—Return the floating point value x rounded to n digits after the decimal point. If n is omitted, it defaults to zero. The result is a floating point number. Values are rounded to the closest multiple of 10 to the power minus n; if two multiples are equally close, rounding is done away from 0 (so, for example, round(0.5) is 1.0 and round(‐0.5) is ‐1.0).
