CS 111: Lab 1 main content

Student Learning Objectives

Demonstrate the ability to

Use the jGRASP programming environment to create a new Java project at u:\Lab1\ and a new class named SimpleArray.
Use an array of doubles to store and work with a list of values.
Use for loops to sequentially process the values in SimpleArray.

Lab 1 Assignment

Create a new Java project at u:\Lab1\.
To keep thing simple, your Lab1 project should consist of one Java class, SimpleArray, that contains one method, main.
Your main method should read in, store, and calculate statistics on list of numbers entered by the user. Follow the sample session shown below:

Sample Session

  How many numbers would you like to enter? 3

  Please enter the 3 values:
  5.6
  4.5
  8.22

  The values you entered were
  5.6
  4.5
  8.22

  Their sum is 18.32
  Their average is 6.1066666666666665

To Receive Credit

If you finish during Tuesday's lab, ask your TA to come over to check your program and give you credit.
Note: The TA will check your program on your computer. You do not need to print out the source code.
If you are unable during Tuesday's lab, turn in the printout of SimpleArray.java by the start of class on Wednesday.

Programming Challenge

If you finish early, get yourself checked off first!

Re-save your program as HardArray.java, modify your program to prompt the user for the name of the input file and the number of values to read in from the file. Read in these values, display them, and then calculate and display their total and their average.

Section 5.10 beginning on page 311 of your textbook explains how to read in input from a file. Your HardArray.java program will still need to read in the size of the array from the keyboard.

Sample session: Programming Challenge (optional, not required)

  Please enter the name of the input file: numbers.txt
  How many numbers to read in? 5

  The values read in were
  1.122
  2.21
  3.3
  4.456
  5.5555

  Their sum is 16.643500000000003
  Their average is 3.3287000000000004