# Midterm Exam #1
# Review Sheet Hints, Answers and Code


# 1. Let num be the number entered.  Use the lines

while num < 10 or num > 99:
    num = input("That wasn't a two-digit number.  Try again: ")

#    to get the while loop working as desired.



# 2. The really tricky part of this program is to figure out
#    how to test whether the three numbers are NOT all the same.
#    Here's one way to accomplish the task.

import random
die1 = random.randint(1,6)
die2 = random.randint(1,6)
die3 = random.randint(1,6)
print "\t", die1, "\t", die2, "\t", die3
while die1 != die2 or die2 != die3:
    
# The rest of the program continues from here.



# 3. You should find that there are 257 numbers in the list.



# 4. Assuming that "cents" is your variable, type

quarters = cents/25
cents = cents - 25*quarters

#  to figure out the number of quarters.
#  Now do the same for dimes, etc.



# 5. Let "digit" be the random number generated.  Then type

for j in range(1,digit+1):
    print "\t",
print digit

# to tab over the correct number of times.



# 6. There are three such numbers: 351, 702, 711



# 7. You will need to keep track of how many guesses the user has made.
#    Assuming you use the variable `tries', your while loop condition
#    could look something like this

while tries < 7 and guess != "hot pink":
    [give user another guess here, and add 1 to tries]



# 8. On your review sheet, draw a diagonal line from the upper right
#    to lower left corner.  Now figure out how to draw each half of
#    the diagram separately.  In each case try a for loop that looks like

for j in range(0,201,20):



# 9. Note that the centers of the circles are spaced every
#    20 pixels.  So set up a nested for loop that looks like

for x in range(20,181,20):
    for y in range(20,181,20):
        if [use correct condition here]:
            pygame.draw.circle(screen, [0,0,0], [x,y], 5, 1)

# What is true about x+y for the circles we want to draw?



# 10. Suppose the user enters values of x and y for the corner.
#     After drawing the rectangle, use a for loop such as

for j in range(x+10,x+80,10):
    pygame.draw.line(screen, [0,0,0], [j,y], [j,y+30])

# to get the vertical lines inside the rectangle.



# 11. This is an exercise in using and/or correctly.  You will find
#     that parentheses can come in handy here.  For instance, if the
#     guesses are called `name' and `age', then the first statement is

if (name == "Obama" or name == "obama") and age == 51:
    print "You are a wallking encyclopedia of useless trivia!"

    
    
# 12. There is one potential pitfall here; namely, trying to use variables
#     inside an input statement.  To get around this problem, try this:
#     (Notice the comma after the print statement.)

print "And how many", item, "do you need?",
quantity = input("")