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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Problem: Suppose you want to compute the average temperature for the seven days in a week. You might use the following code: Scanner keyboard = new Scanner(System.in); System.out.println("Enter 7 temperature:"); double sum = 0; for (int count = 0; count < 7; count++) { double next = keyboard.nextDouble(); sum = sum + next; } double average = sum / 7; This works fine if all you want to know is the average. But let's say you also want to know which temperatures are above and which are below the average. Now you have a problem in order to compute the average, you must read the seven temperatures, and you must compute the average before comparing each temperature to it. Thus, to be able to compare each temperature to the average, you must remember the seven temperatures. How can you do this? The obvious answer is to use seven variables of the type of double. This is a bit awkward, because seven is a lot of variables to declare, and in other situations, the problem can be even worse. Imagine doing the same thing for each day of the year instead of just each day of the week. Writing 365 variable declarations would be absurd. Arrays provide us with an elegant way to declare a collection of related variables. An array is a collection of items of the same type. It is something like a list of variables, but it handles the naming of the variables in a nice, compact way. Filename: ArrayOfTemperatures.java

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