Laboratory 4

CSCI 110, Spring 2011

Laboratory 4
Due at the end of today's class

Problem 1:
In this problem you will write the program code to do the work of the count( ) function in Python. Write a program, named searchInventory.py, that asks the user what item they would like to search for and then uses a for loop to search for that item in a list. The program should print out the number of times the item occurs in the list. If there are zero or more than one occurence of the item, the program should add an 's' to the name of the item when it reports the number found. Note: Do not use the count( ) function to solve this problem!

You should use the following template for your program:

#Program: searchInventory.py
#Include your program prologue here

inventory = ["gold coins", "axe", "healing potion", "axe", "shield", "lantern"]

item = raw_input("What item would you like to search for? ")
itemCount = 0

#Use a for loop here to examine each item in the list and count the number of 
#occurrences of item

if itemCount == 1:
    print "You have 1 " + item + "."
else:
    print "You have", itemCount, item + "s."

The following are sample outputs of the program:
Sample output 1:

What item would you like to search for? axe
You have 2 axes.

Sample output 2:

What item would you like to search for? shield
You have 1 shield.

Problem 2: Write a program, named addEvens.py, that uses a for loop to sum up all the even numbers from 2 to some high number entered by the user.

You may use the following program template:

#Program: addEvens.py
#Include your program prologue here

print "This program sums all the even numbers up to a given number."
highNum = input("What is the highest number you would like to add? ")
total = 0

print "The numbers are: "
#Use a for loop with the range function to print and total all the even numbers 
#up to highNum

print "The total is:", total

The following are sample outputs of the program:
Sample output 1:

This program sums all the even numbers up to a given number.
What is the highest number you would like to add? 6
The numbers are: 
2
4
6
The total is: 12

Sample output 2:

This program sums all the even numbers up to a given number.
What is the highest number you would like to add? 9
The numbers are: 
2
4
6
8
The total is: 20

Problem 3:
Write a program, named timesTwo.py, that uses a for loop to multiply the value of each number in a list by 2. The program must change the values in the list and then print out the updated values. You should use the following program template:

#Program: timesTwo.py
#Include your program prologue here

theList = [1, 3, 17, 5, 6, 14]

print "The values in the list are: "
for i in theList:
    print i

#Use a for loop here to multiply each item in the list by two.

print "The doubled list is: "

for i in theList:
    print i

The following is the output of the program:
Sample output:

The values in the list are: 
1
3
17
5
6
14
The doubled list is: 
2
6
34
10
12
28

What To Turn In.

A printed listing of the lab programs. Be sure that your name is in the program prologue’s comment section of the program.

Reminder.

Be sure to save a copy of each program on your P:\ drive.