These are the solutions to the problems for the first homework exam. 

The list of problems are indexed under Class Notes. 

Problem 1. 

n = int(raw_input("Enter first number: "))
m = int(raw_input("Enter second number: "))

print n+m, n-m, n*m, (n+m)/2, abs(n-m), (n + m + abs(n - m)) / 2

Problem 2. 

n = float(raw_input("Enter distance in meters: "))

print n, "meters is", n * 0.000621371192, "miles"
print n, "meters is", n * 3.2808399, "feet"
print n, "meters is", n * 39.3700787, "inches"


Problem 3. ----------------------------------------------------------

radius = float(raw_input("Enter radius: "))

pi = 3.141592

print "Circumf. of circle", 2 * pi * radius
print "Area of circle", pi * radius * radius
print "Area of sphere", 4 * pi * pow(radius, 2)
print "Volume of sphere", 4 * pi * pow(radius, 3) / 3

print "Wrong volume of sphere", 4 / 3 * pi * pow(radius, 3)
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Problem 4. ----------------------------------------------------------

height = float(raw_input("Please enter the height: "))
width = float(raw_input("Please enter the width: "))

area = height * width
perimeter = height + width + height + width 

print "Area", area
print "Perimeter", perimeter

diagonal = pow( height * height + width * width, 0.5)
print "Diagonal", diagonal

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Problem 5. ----------------------------------------------------------

price = float(raw_input("Price of purchase:"))
amount = float(raw_input("Enter amount paid:"))

change = amount - price

change = int(change * 100)

dollars = change / 100
afterdollars = change % 100

quarters = afterdollars / 25
afterdollarsandquarters = afterdollars % 25

dimes = afterdollarsandquarters / 10
remaining = afterdollarsandquarters % 10

nickels = remaining / 5
cents = remaining % 5

print "Change is"
print "  ", dollars, "dollars"
print "  ", quarters, "quarters"
print "  ", dimes, "dimes"
print "  ", nickels, "nickels"
print "  ", cents, "cents"

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Problem 6. 

fuel = float(raw_input("Amount of fuel in gallons:"))

efficiency = float(raw_input("Car's efficiency:"))

price = float(raw_input("Price of fuel per gallon:"))

print "Car's autonomy is:", fuel * efficiency, "miles"

print "It costs you", 100 / efficiency * price, "dollars to travel 100 miles"

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Problem 7. ----------------------------------------------------------

a = raw_input("Enter the first time:")
b = raw_input("Enter the second time:")

t1 = int(a[0:2]) * 60 + int(a[2:4])

t2 = int(b[0:2]) * 60 + int(b[2:4])

print (t2 - t1) / 60, "hours and", (t2 - t1) % 60, "minutes"

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Problem 8.


months = "January  February March    April    May      June     July     August   SeptemberOctober  November December"

input = int(raw_input("Enter month number:"))

index = (input - 1) * 9

print months[index:index+9]

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