* Question: Write a program in Java to check if a number is even or odd? * Answer 1: Using the modulus operator. (1). Create project: CheckEvenOddModulus (2). Create package: com.webmobileaz (3). com.webmobileaz => File: Numbers.java package com.webmobileaz; import.
Android is everywhere: Phones, Tablets, TVs and set-top boxes powered by Google TV. Soon, Android will be in cars, in in-flight entertainment system on planes, and even in robots! However, the general theme of Android devices will be smaller screens.
After you declare a variable, you must explicitly initialize it by means of an assignment statement - you can never use the value of an uninitialized variable. For example, the Java compiler flags the following sequence of statement as an error: int vacationDays; System.out.println(vacationDays);.
In Java, every variable has a type. You declare a variable by placing the type first, followed by the name of the variable. Here are some example: double salary; int vacationDays; long earthPopulation; boolean done; Notice the semicolon at the end of each.
The boolean type has two values, false and true. It is used for evaluating logical conditions. You cannot convert between integers and boolean values. * Note: In C++, numbers and even pointers can be used in place of boolean values. The value 0 is equivalent.
The char type is used to describe individual characters. Most commonly, these will be character constants. For example, 'A' is a character constant with value 65. It is different from "A", a string containing a single character. Unicode code units can be expressed.
The floating-point types denote numbers with fractional parts. The two floating-point types: TypeStorage RequirementRange(inclusive) float4 bytesApproximately 1.4E-45 to 3.4028235E38 ( 6-7 significant decimal digits) double8 bytesApproximately.
The integer types are for numbers without fractional parts. Negative values are allowed. Java provides the four integer types: TypeStorage RequirementRange(inclusive) int4 bytes-2,147,483,648 to 2,147,483,637 (just over 2 billion) short2 bytes-32,768 to 32,767 long8.
- Java is strongly typed language. This means that every variable must have a declared type. There are eight primitive types in Java: + Four of them are integer types. + Two are floating-point number types. + One is the character.
Comments in Java, as in most programming language, do not show up in the executable program. Thus, you can add as many comments as needed without fear of bloating the code. Java has three ways of marking comments. The most common form is a //. You use this.
