Difference between revisions of "Java/C2/For-Loop/English"

Welcome

Learning Outcomes

Tools Used

• Ubuntu 11.10,
• JDK 1.6 and
• Eclipse 3.7.0

Prerequisites

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Syntax

It consisits of initialization, loop condition and increment. Then it has the for block which keeps on executing till the loop condition is true.

Now, let us try out an example in Eclipse.

Eclipse should contain the following code

public class ForLoopDemo{

public static void main(String[] args){

}

}

We already have a class named ForLoopDemo.

Let us add the for loop inside the main method.

int i;

for (i = 0; i < 10; i = i + 1)

Highlight when you explain.

Then for open curly braces i equal to 0 semicolon i less than 10 semicolon i equal to i plus 1.

This statement decides how the loop is going to progress.

This condition allows the variable to be initialized. -

If the condition is true then the for block will be executed.

Else it will be ignored.

That means when i becomes more than or equal to 10, the block is not executed.

Here, the value of i starts with 0.

It keeps increasing by 1 for every iteration of the loop until it becomes 10.

Now let us do something with i.

System.out.println( i * i );

}

Highlight the println statement and explain.

Inside the curly brackets type System dot out dot println and print  i into i.

This will print the square of each number from 0 to 9.

Let us see the output.

So save and run the program

The square of the number has been printed in each iteration.

Now let us print all the 2 digit numbers that are multiples of 3 or 5.

So change i equal to 0 to i equal to 10.

if ((i % 3 == 0) || (i % 5 == 0)){

System.out.println(i);

}

Then inside the curly brackets We print the number only if it is a multiple of 3 or 5.

So type,

if within brackets i mod 3 double equal to 0 or within brackets i mod 5 double equal to 0.

This statement checks whether i is divisible by 3 or by 5.

Then, in curly bracket we print the value of i

Now, let us see the output.

So save and run the program

Slide 6

Summary

In this tutorial we have learnt how to use for loop in java.

For example, 153 is equal to 1 cube plus 5 cube plus 3 cube.

Find all such 3 digit numbers.

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