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04-arrayintlist - CSE 143 Lecture 4 Implementing...

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CSE 143 Lecture 4 Implementing ArrayIntList slides created by Marty Stepp http://www.cs.washington.edu/143/
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2 Exercise • Write a program that reads a file (of unknown size) full of integers and prints the integers in the reverse order to how they occurred in the file. Consider example file data.txt : 17 932085 -32053278 100 3 When run with this file, your program's output would be: 3 100 -32053278 932085 17
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3 Solution using arrays int[] nums = new int[100]; // make a really big array int size = 0; Scanner input = new Scanner(new File("data.txt")); while (input.hasNextInt()) { nums[size] = input.nextInt(); // read each number size++; // into the array } for (int i = size - 1; i >= 0; i--) { System.out.println( nums[i] ); // print reversed } 5 size index 0 1 2 3 4 5 6 ... 98 99 value 17 932085 -32053278 100 3 0 0 ... 0 0
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4 Unfilled arrays int[] nums = new int[100]; int size = 0; • We often need to store an unknown number of values. Arrays can be used for this, but we must count the values. Only the values at indexes [0, size - 1] are relevant. • We are using an array to store a list of values. What other operations might we want to run on lists of values? 5 size index 0 1 2 3 4 5 6 ... 98 99 value 17 932085 -32053278 100 3 0 0 ... 0 0
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5 Other possible operations public static void add( int[] list, int size
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