Description
Problem 1 [15pts]. Write a program that computes the slope of a line given two of its
points on the plane. In more detail, the program reads (from keyboard) two points p =
(xp, yp) and q = (xq, yq), and computes the slope m of the line that crosses p and q using the
following formula
m =
yq − yp
xq − xp
.
You program should first check to see if xq = xp in which case it should print ”The line is
vertical!” Below are two examples of how the program should behave
Example 1:
Enter the x-value of the first point: 3
Enter the y-value of the first point: 10
Enter the x-value of the second point: 7
Enter the y-value of the second point: 20
The slope of this line is 2.5
Example 2:
1
Enter the x-value of the first point: 22
Enter the y-value of the first point: 10
Enter the x-value of the second point: 22
Enter the y-value of the second point: 20
The line is vertical!
Note that you must compute the slope as a floating-point number.
Problem 2 [20pts]. Write a program that inputs the name, quantity, and price of three
items. The name may contain spaces. Output a bill with a tax rate of %6.25. All prices
should be output to two decimal places. The bill should be formatted in columns with 30
characters for the name, 10 characters for the quantity, 10 characters for the price, and 10
characters for the total. Sample input and output are shown as follows:
Input name of item 1:
lollipops
Input quantity of item 1:
10
Input price of item 1:
0.50
Input name of item 2:
diet soda
Input quantity of item 2:
3
Input price of item 2:
1.25
Input name of item 3:
chocolate bar
Input quantity of item 3:
20
Input price of item 3:
0.75
Your bill:
Item Quantity Price Total
lollipops 10 0.50 5.00
diet soda 3 1.25 3.75
chocolate bar 20 0.75 15.00
Subtotal 23.75
6.25 percent sales tax 1.48
Total 25.23
2
