tag:blogger.com,1999:blog-7621128268735555892024-11-05T18:43:28.285-08:00A site for programming students and teachers.Unknownnoreply@blogger.comBlogger138125tag:blogger.com,1999:blog-762112826873555589.post-11326624985687415612012-01-06T22:19:00.000-08:002012-01-06T22:19:25.923-08:00

Java Data Types Integer Name                    Width(in bits)                                              Rangelong                      64      &nbsp

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Command Line ArgumentsThere are certain conditions where the user is required to pass arguments while running a program at the command line. For example, in DOS to delete a file we use the command “del filename” at the “C:” prompt and the specified file is deleted. In this case “del” is the command or the action that we want to perform and “filename” is known as the “Command Line Argument”. It

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-59328722988922837662011-12-29T08:43:00.000-08:002011-12-29T08:52:57.322-08:00

Another Basic Example 1. Open the editor, and type the following code class prog2{                                    public static void main(String args[])            &

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-64881755046495469552011-12-27T21:30:00.000-08:002011-12-27T21:30:08.435-08:00

How does it work ?Compiling the program : To compile a program we have to use the statement javac prog1.java (where “prog1.java” is the name of the Java program) Java Program Compilation Process This statement invokes the Java compiler, javac and compiles the program. As a result of this compilation a new file having the name “prog1.class” is created. This “.class” file has

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First Java Program - Using an Editor  So you are ready to start with your first Java program. Here is a step by step procedure to create your first Java program in an editor.1.    Verify the correct path of Java installation to see whether it is in C:, D: or any other drive. If you didn't play with the installation then by default Java will be installed at "C:\Program

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-6771411182212730642011-12-21T08:54:00.000-08:002011-12-21T08:54:24.431-08:00

PathIn DOS and Windows systems, a path is a list of directories where theoperating system looks for executable files if it is unable to find the file in the working directory. You can specify the list of directories with the PATH command. A path points to a file system location by following the directory tree hierarchy

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-58576035283527707892011-12-20T08:14:00.000-08:002011-12-20T08:14:52.125-08:00

How to create a Java Program : There are two ways to create a Java program 1. Using a text editor : To create a Java application we can use any editor and start typing the code. Since JDK does not contain an editor, the Windows users can use Notepad whereas the user of Linux can user Vi or any other editor. You can even download any third party editor from the internet. Some people may ask

Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-762112826873555589.post-64187913783090640512011-12-15T03:38:00.000-08:002011-12-15T03:38:49.229-08:00

At the heart of the Java platform lies the Java Virtual Machine, or JVM. Most programming languages compile source code directly into machine code, suitable for execution on a particular microprocessor architecture. The difference with Java is that it uses bytecode - a special type of machine code. Java bytecode executes on a special type of microprocessor. Strangely enough, there wasn't a

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-77588824984211534442011-12-13T23:48:00.000-08:002011-12-13T23:48:28.249-08:00

JRE The Java Runtime Environment (JRE), also known as Java Runtime, is part of the Java Development Kit (JDK), a set of programming tools for developing Java applications. The Java Runtime Environment provides the minimum requirements for executing a Java application; it consists of the Java Virtual Machine (JVM), core classes, and supporting files. The Java Runtime Environment (

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-51094590660032507792011-12-11T21:52:00.000-08:002011-12-11T21:52:07.128-08:00

What is JDK                                             Download JDK JDK stands for Java Development Kit. JDK is a set of tools that are used to create,test and debug a Java

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-49966879925401584712011-12-02T02:35:00.000-08:002011-12-02T02:35:53.687-08:00

Introduction to Java Java is a programming language originally developed by James Gosling at Sun Microsystems (now part of Oracle Corporation) and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to bytecode (class

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-71780558143615685122011-11-30T21:40:00.000-08:002011-11-30T21:40:52.800-08:00

Wish to get into IT? Make sure you know the basics. Here’s what IT is all about: What is information technology ? The Information Technology industry is a large industry. Over the past 50 years, IT has shaped the modern world & continues to change it. The major segments in IT are hardware & software. Software consists of products & services. Software products are packaged or

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Programmers ·         Assist systems analysts in defining requirements of users of the proposed IT system.·         Create a detailed design for the proposed system.·         Translate specifications - for a software product or project - given by the systems analyst into lines

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-45387231155551777602011-11-06T01:50:00.000-07:002011-11-06T01:13:48.527-08:00

Lets write a code to store some data in a file in binary mode using the write() Example 1 #include "iostream.h" #include "fstream.h" #include "conio.h" class person {  char name[10],addr[20];  int age; public:  void getpers()  {   cout<<"\nEnter name : ";   cin>>name;   cout<<"\nEnter address : ";   cin>>addr; &

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-72176388290546901942011-11-06T01:41:00.000-07:002011-11-06T01:41:07.635-07:00

In the earlier posts, I wrote about handling text or character files. Now is the time to learn another type of file handling - Binary File Handling.  What is a Binary File All the files that we use are not text or char files. We don't "read" all the files, some of them are "heard" or "viewed"  also like audio, picture or video files. A char file is something that stores only char

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-42763353880933972122011-11-06T01:23:00.000-07:002011-11-06T01:23:40.236-08:00

A file that has been created using binary functions like "fwrite" can only be read using the "fread" function that can read or process a binary file. Following is the same code that was given in the previous post "Writing a binary file - Using write()". If you look at the end of the code you will see that there some additional statements there. Example 1 #include "iostream.h" #include "

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-33077622348428489262011-10-20T04:13:00.000-07:002011-10-20T04:13:29.515-07:00

Copying a file To copy the contents of a file to another, we will use both get() and put() in the same code. To make this program, we will open two files at the same time , the source file(the one that we want to copy) and the target file(the file that will contain the copied data). The source file will be opened in the read mode(using ifstream) whereas the target file will be

Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-762112826873555589.post-6472263498227400042011-10-20T03:55:00.000-07:002011-10-20T03:55:51.692-07:00

Using the get() we can easily write a program that can count the number of characters in a file. This will be quite similar to the Word Count option available in Ms-Word. #include "conio.h"#include " ctype.h" // for character functions#include "iostream.h"#include "fstream.h"void main(){ clrscr(); ifstream in("file1.txt"); // name of any existing file int chars=0,caps=0,

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-22604611297074304552011-10-18T23:22:00.000-07:002011-10-18T23:22:52.123-07:00

Reading the whole file using get() The get() can not read more than one character at a time , therefore we must use a loop to read the file. The while loop is most suitable for reading a file since we don't know how much data is there in the file. #include "conio.h"#include "iostream.h"#include "fstream.h"void main(){ clrscr(); ifstream in("file1.txt"); char c; in.get(c);&

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-37892160180274172011-10-18T23:06:00.000-07:002011-10-18T23:06:32.561-07:00

The get() function The get() can read a char from a file. It is used when we want to read a single character from a file. To read all the data of a file, the same function can be enclosed inside a loop. Syntax ifstream.get(char); Example : Lets see the following code snippet that makes use of the "get()" to read a char from the file. #include "conio.h"#include "iostream.h"#include "

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-39953784834677500822011-10-18T22:48:00.000-07:002011-10-18T22:50:56.005-07:00

Using the put() to write a string To write multiple characters in a file using the "put()", we can use the function inside a loop.  Without a loop it is not possible to write a complete string with put(), since the put() can not write more than one character at a time, #include "conio.h"#include "iostream.h"#include "fstream.h"#include "string.h"void main(){ clrscr(); 

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-17620569104504453332011-10-18T22:33:00.000-07:002011-10-18T22:35:53.345-07:00

To read a file one char at a time, we can use the "put()". The put() writes a character to a file. To write multiple characters we can either use the put() inside a loop or we can use functions that read the data string by string. Syntax ofstream.put(char); Example 1 : Lets see how the put() can be used to write a single character in the file. #include "conio.h"#include "fstream.h"#include "

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-73672797789801586552011-09-07T22:31:00.000-07:002011-09-07T22:34:12.442-07:00

Reading a file using the redirection operator ">>" #include<iostream.h> #include<conio.h> #include<fstream.h> void main() { ifstream in("data"); char name[20],addr[20]; in >>name>>addr; cout< in.close(); }

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-22924302122921308032011-08-26T02:58:00.000-07:002011-09-07T22:23:56.225-07:00

Program to store data in a file using the redirection operator "<<" #include<iostream.h> #include<conio.h> #include<fstream.h> void main() { ofstream out("data"); // creating a file in out(writing) mode. char name[20],addr[20]; cout<<"\nName : "; cin>>name; cout<<"\nAddress : "; cin>>addr; out<<name<<"\n"<<addr; //

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-762112826873555589.post-73435272389322902252011-08-24T22:34:00.000-07:002011-08-24T22:34:14.151-07:00

File Modes In C++ ModeDescription ios::appIf FileName is a new file, data is written to it. If FileName already exists and contains data, then it is opened, the compiler goes to the end of the file and adds the new data to it. ios::ateIf FileName is a new file, data is written to it and subsequently added to the end of the file. If FileName

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