free visual basic barcode generator Declaring Loop Control Variables Inside the for Loop in Java

Creator QR Code 2d barcode in Java Declaring Loop Control Variables Inside the for Loop

Declaring Loop Control Variables Inside the for Loop
QR Generator In Java
Using Barcode creation for Java Control to generate, create QR Code image in Java applications.
Scan QR In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Often the variable that controls a for loop is only needed for the purposes of the loop and is not used elsewhere When this is the case, it is possible to declare the variable inside the initialization portion of the for For example, here is the preceding program recoded so that the loop control variable n is declared as an int inside the for:
Bar Code Generation In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
Barcode Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
// Declare a loop control variable inside the for class ForTick { public static void main(String args[]) { // here, n is declared inside of the for loop for(int n=10; n>0; n--) Systemoutprintln("tick " + n); } }
QR Maker In Visual C#
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET applications.
QR Code ISO/IEC18004 Generation In .NET
Using Barcode maker for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
When you declare a variable inside a for loop, there is one important point to remember: the scope of that variable ends when the for statement does (That is, the scope of the variable is limited to the for loop) Outside the for loop, the variable will cease to exist If you need
QR Code Creation In Visual Studio .NET
Using Barcode printer for Visual Studio .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
QR Code ISO/IEC18004 Drawer In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create Quick Response Code image in .NET framework applications.
Part I:
Create Data Matrix 2d Barcode In Java
Using Barcode generator for Java Control to generate, create DataMatrix image in Java applications.
Printing 2D Barcode In Java
Using Barcode maker for Java Control to generate, create Matrix Barcode image in Java applications.
The Java Language
Print Bar Code In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
Draw EAN128 In Java
Using Barcode encoder for Java Control to generate, create UCC.EAN - 128 image in Java applications.
to use the loop control variable elsewhere in your program, you will not be able to declare it inside the for loop When the loop control variable will not be needed elsewhere, most Java programmers declare it inside the for For example, here is a simple program that tests for prime numbers Notice that the loop control variable, i, is declared inside the for since it is not needed elsewhere
Create OneCode In Java
Using Barcode maker for Java Control to generate, create Intelligent Mail image in Java applications.
USS Code 128 Printer In None
Using Barcode maker for Microsoft Word Control to generate, create Code 128C image in Microsoft Word applications.
// Test for primes class FindPrime { public static void main(String args[]) { int num; boolean isPrime = true; num = 14; for(int i=2; i <= num/i; i++) { if((num % i) == 0) { isPrime = false; break; } } if(isPrime) Systemoutprintln("Prime"); else Systemoutprintln("Not Prime"); } }
ECC200 Printer In Objective-C
Using Barcode maker for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications.
Make GS1 128 In VB.NET
Using Barcode encoder for .NET Control to generate, create USS-128 image in VS .NET applications.
Using the Comma
Code39 Recognizer In VB.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
Printing Linear 1D Barcode In .NET Framework
Using Barcode generation for .NET framework Control to generate, create Linear 1D Barcode image in .NET framework applications.
There will be times when you will want to include more than one statement in the initialization and iteration portions of the for loop For example, consider the loop in the following program:
GS1-128 Scanner In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
Generating Code 3/9 In .NET Framework
Using Barcode drawer for Visual Studio .NET Control to generate, create Code 39 Extended image in VS .NET applications.
class Sample { public static void main(String args[]) { int a, b; b = 4; for(a=1; a<b; a++) { Systemoutprintln("a = " + a); Systemoutprintln("b = " + b); b--; } } }
As you can see, the loop is controlled by the interaction of two variables Since the loop is governed by two variables, it would be useful if both could be included in the for statement, itself, instead of b being handled manually Fortunately, Java provides a way to accomplish this To allow two or more variables to control a for loop, Java permits you to include multiple statements in both the initialization and iteration portions of the for Each statement is separated from the next by a comma Using the comma, the preceding for loop can be more efficiently coded as shown here:
// Using the comma class Comma {
5:
Control Statements
public static void main(String args[]) { int a, b; for(a=1, b=4; a<b; a++, b--) { Systemoutprintln("a = " + a); Systemoutprintln("b = " + b); } } }
In this example, the initialization portion sets the values of both a and b The two commaseparated statements in the iteration portion are executed each time the loop repeats The program generates the following output: a b a b = = = = 1 4 2 3
NOTE If you are familiar with C/C++, then you know that in those languages the comma is an
operator that can be used in any valid expression However, this is not the case with Java In Java, the comma is a separator
Some for Loop Variations
The for loop supports a number of variations that increase its power and applicability The reason it is so flexible is that its three parts the initialization, the conditional test, and the iteration do not need to be used for only those purposes In fact, the three sections of the for can be used for any purpose you desire Let s look at some examples One of the most common variations involves the conditional expression Specifically, this expression does not need to test the loop control variable against some target value In fact, the condition controlling the for can be any Boolean expression For example, consider the following fragment:
boolean done = false; for(int i=1; !done; i++) { // if(interrupted()) done = true; }
In this example, the for loop continues to run until the boolean variable done is set to true It does not test the value of i Here is another interesting for loop variation Either the initialization or the iteration expression or both may be absent, as in this next program:
// Parts of the for loop can be empty class ForVar { public static void main(String args[]) { int i;
Part I:
Copyright © OnBarcode.com . All rights reserved.