ICS4U1 Course Calendar

Printf practice

Modulus

Learn x++ vs ++x

• Splitting digits
  • Take a two digit integer and separate the digits (into ints)
    e.g. if int n = 83; then make int a = 8 and int b = 3;
  • Try and think of 3 different ways to do this (one will involve %)

* not marked, just discussed in class

Scanner practice

Quadratic Formula (scroll down)

Discuss random #, arrays

• Array Review
  • Make an array of size 12 that contains ints
  • Fill it with random numbers that range from 1-100
  • Print out the array
  • Find the largest, find the smallest number. Do this without sorting the array.
  • This will test for knowledge of: arrays, random numbers, loops, logic.

Don't need scanner

2D Array Assignment

• Sorting Arrays
  • Work with a partner and write a program to sort an array
  • Make the array ints, size 12 or 15, with random # that go from 1-100
  • Sort the array in place
  • Use a SELECTION sort or INSERTION sort as discussed in class

return array quiz
finish sorting program
we'll discuss strings in class

• String programs
  • From the link below, do the following programs
  • "CountingThe.java", "Numbers.java", and "RandomWord.java"
  • String programs link

• File I/O
  • (1) Using Scanner, read in the first 15 lines of the file below and print them out
  • (2) Using BufferedReader, read in the first 15 lines of the file below and print them out
  • words_alpha.txt
  • (download this file and save it in your Java project)

• MillionWord.java
  • Write a program to find "million" words: words whose letters multiply to make 1 million
  • Use words_alpha.txt
    The word list must have only one word on a line. It is assumed that the words are all lowercase.

  • final static int TARGET = 1_000_000;
    final static int CUTOFF = 500;

    .: ie. within +- 500 of 1 million