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wardlPS1.py
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wardlPS1.py
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#################################################################
#
# Author: Lucas Ward
# Date: January 11th, 2008
# Program: Problem Set 1
# Program Name: wardlPS1.py
#
#################################################################
#precondition: x is is an integer
#postcondition: returns True if x is even and False otherwsie
def isEven(x):
return (x%2) == 0
#precondition: r is a nonnegative number
#postcondition: returns the volume of a sphere with radius r.
def sphereVolume(x):
return (3.14*(x**3))*4/3
#prec: x is a number
#postc: returns the fractional part of the number
#example: fracPart(4.5) = .5, fracPart(-3.1) = .9
def fracPart(x):
return 1 - (x%1)
#prec: x is a nonnegative integer
#postc: returns the sum of the last two digits of x
def sumOfLastTwoDigits(x):
if x < 10:
return "must be greater then ten!"
list0 = list(str(x % 100))
return int(list0[0]) + int(list0[1])
#prec: x is an integer
#postc: returns the first digit of x
def firstDigit(x):
list0 = list(str(x))
return int(list0[0])
#prec: days, hourse, minutes, seconds are nonnegative integers
#postc: returns thhe total number of seconds elapsed in the given time.
def seconds(days, hours, minutes, seconds):
a = days*86400
b = hours*3600
c = minutes*60
d = seconds
return (a+b+c+d)
#prec: dividend, divisor are integers; divisor is not zero
#postc: return True if divisor divides dividend evenly.
def isDivisible(dividend, divisor):
value = str(float(dividend)/divisor)
lastPeriod = value.rfind(".")
lastPeriod += 1
value2 = value [lastPeriod:]
if value2 == '0':
print "true"
else: print "false"
#prec: moe, larry, joe are integers
#post: returns true if moe < larry <= joe.
def isIncreasing(moe, larry, joe):
if moe < larry <= joe:
print "true"
else: print "false"
#prec: secs is an integer
#post: return a tuple (days, hours, min, sec) so that
# 0 <= sec < 60
# 0 <= min < 60
# 0 <= hr < 24
#for example, secs(3800) returns (0,1,3,20)
###Hint: % is your friend!
def dhms(secs):
day = secs/86400
secs=secs%86400
hour = secs/3600
secs=secs%3600
min = secs/60
secs=secs%60
sec = secs
return (day, hour, min, sec)
##################################################
##############main routine (where tests suites go#
##################################################
print
print "isEven(34) = ", isEven(34), "expected: true"
print "isEven(3) = ", isEven(33), "expected: false"
print "isEven(1467) = ", isEven(31), "expected: false"
print
print "sphereVolume(10) = ", sphereVolume(10), "expected: 4186.667"
print "sphereVolume(23) = ", sphereVolume(23), "expected: 50939.173333"
print "sphereVolume(2) = ", sphereVolume(2), "expected: 33.4933333333"
print
print "fracPart(5.5) = ", fracPart(5.5), "expected: .5"
print "fracPart(56.78) = ", fracPart(56.78), "expected: .22"
print "fracPart(-12.2) = ", fracPart(-12.2), "expected: .2"
print
print "sumOfLastTwoDgits(456) = ", sumOfLastTwoDigits(456), "expected: 11"
print "sumOfLastTwoDgits(1000000098) = ", sumOfLastTwoDigits(1000000098), "expected: 17"
print "sumOfLastTwoDgits(5) = ", sumOfLastTwoDigits(5), "expected: look left, read."
print
print "firstDigit(234643) = ", firstDigit(234643), "expected: 2"
print "firstDigit(4) = ", firstDigit(4), "expected: 4"
print "firstDigit(9999999) = ", firstDigit(9999999), "expected: 9"
print
print "seconds(3, 3, 7, 6) = ", seconds(3, 2, 67, 6), "expected: 270426"
print "seconds(1, 6, 9, 58) = ", seconds(1, 6, 9, 58), "expected: 108598"
print "seconds(1000, 23, 59, 59) = ", seconds(1000, 23, 59, 59), "expected: 86486399"
print
print "isDivisible(8, 4) = ",
isDivisible(8, 4),
print "expected: true"
print "isDivisible(7, 4) = ",
isDivisible(7, 4),
print "expected: false"
print "isDivisible(1, 4) = ",
isDivisible(1, 4),
print "expected: false"
print
print "isIncreasing(1, 2, 3) = ",
isIncreasing(1, 2, 3)
print "expected: true"
print "isIncreasing(4, 2, 3) = ",
isIncreasing(4, 2, 3)
print "expected: false"
print "isIncreasing(-99, -3, 1004) = ",
isIncreasing(-99, -3, 1004)
print "expected: true"
print
print "dhms(86410) = ", dhms(86410), "expected: (1,0,0,10)"
print "dhms(3723) = ", dhms(3723), "expected: (0,1,2,3)"
print "dhms(0) = ", dhms(0), "expected: (0,0,0,0)"