cs101 ยป

# Unit 2 Challenge Questions

'Challenge questions' are labeled with Gold Stars and are intentionally more difficult than the normal homework questions.

Not every student is expected to correctly solve every problem. Challenge questions are intended to take more time, and provoke more thought than the normal questions. The more difficult the question is, the more Gold Stars it will be labeled with. You shouldn't be discouraged if you don't solve them.

## Question 7 - Multiplication Table (2 Gold Stars)

``````# Multiplication Table
# Define a procedure, print_multiplication_table,
# that takes as input a positive whole number, and prints out a multiplication,
# table showing all the whole number multiplications up to and including the
# input number. The order in which the equations are printed matters.

# Hint: You can not add an integer and a string, but in homework 1.9
# you came across a method, str, for turning an integer into a string.

def print_multiplication_table(n):
i = 1;
while (i <= n):
j = 1;
while (j <= n):
print str(i) + ' * ' + str(j) + ' = ' + str(i * j)
j = j + 1
i = i + 1

print_multiplication_table(2)
#>>> 1 * 1 = 1
#>>> 1 * 2 = 2
#>>> 2 * 1 = 2
#>>> 2 * 2 = 4

print_multiplication_table(3)
#>>> 1 * 1 = 1
#>>> 1 * 2 = 2
#>>> 1 * 3 = 3
#>>> 2 * 1 = 2
#>>> 2 * 2 = 4
#>>> 2 * 3 = 6
#>>> 3 * 1 = 3
#>>> 3 * 2 = 6
#>>> 3 * 3 = 9
``````