William Stewart wrote:
hello
I need to rewrite area.py program so that it has separate functions for the perimeter and area of a square, a rectangle, and a circle (3.14 * radius**2).
I am horrible at math and I cannot even figure out what I need to do for this
Any help would be appreciated
Have you learned about functions? Here's an example. Put this in a file and
try it.
def get_drink():
answer = raw_input("Would you like a cup of tea? (y/n) ").lower()
while answer not in ('y', 'yes', 'n', 'no'):
print "I'm sorry, I don't understand that response."
print "Please enter Yes or No."
answer = raw_input("Would you like a cup of tea? (y/n) ").lower()
if answer in ('y', 'yes'):
return "a nice steaming cup of tea, with a couple of biscuits"
else:
return "a stale cup of bitter coffee"
drink = get_drink()
print "I have", drink
Notice a few things:
First, you define a function with the "def" keyword, and give it a name, in
this case, "get_drink". Names should usually be verbs ("doing words"), because
functions do things.
Second, the function normally should use the "return" statement to send a
result back to the caller.
Third, you call the function by name, using round brackets (parentheses) to
indicate to Python that you are calling it, and save the result in a variable
("drink" in the above example).
And finally, you can then use the variable for further processing.
In your case, you want six functions, to get the area of a square, the
perimeter of a rectangle, etc. So for each function, you need to decide on a
descriptive name, such as this:
def get_area_of_square():
# Ask the user for the width of the square.
...
# Calculate the area.
area = width**2
return area
The dots ... need to be filled in by you. Your program already has code that
asks the user for a width, just grab it and put it inside the function.
The formulae you need are:
SQUARES:
area = width*width = width**2
perimeter = width+width+width+width = 4*width
RECTANGLES:
area = width*height
perimeter = width+height+width+height = 2*(width+height)
CIRCLES:
area = pi*radius**2
circumference = 2*pi*radius
To get the value of pi, put this at the top of your program:
from math import pi
Hope this helps.
--
Steven
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