Cottons Class Room

Sunday, 23 July 2017

Monday, 10 July 2017

Class 7 : HTML

HTML (Hyper Text MarkUp Language) is used to create web pages. The codes are called tags. The tags are given within < and >.

There are two types of tags ,

i. Container Tag : It has both opening and closing tags.

ii. Empty Tag : It has only an opening tag.

The basic structure of a HTML document is

<html>

<head>

<title>

</title>

</head>

<body>

………

……..

</body>

</html>

Whatever is typed between <title> and </title> will be displayed on the title bar not in the web page.

<html>

</head>

<body>

Your text goes here.

</body>

</html>

The data entered between <body> and </body> only will be displayed in the web page.

Line Break Tag:

The cursor moves to the next line.

Paragraph Tag :

It gives a blank line.

Heading Tag : Heading tags are used to display the text slightly bigger and bolder. There are six levels. Level 1 is the largest.

The output will be:

Formatting Tags :

1. Bold : …

2. Italics : ….

3. Underline : ….

4. Superscript : …..

5. Subscript : ….

6. Center Tag: The spelling is important. It positions the text in the center of the screen. <center>....</center>

7. Strikethrough : <strike> ..... </strike> : It draws a line through

the middle of the text.

The output will be:

Sunday, 5 March 2017

Sunday, 26 February 2017

Class 8 - String functions

Click here to open String Function Quiz

Thursday, 12 January 2017

Class 9 - switch

Points to remember:

1. switch,case and default in small letters

2. After switch , the constant must be either integer or character constant.

3. If the input doesnot match any given choices , the default will be executed.

4.break statement is compulsory, otherwise all the cases will be executed.

5. After case and the constant , there is a colon(:)

6. After switch there is no semi colon.

7. No two cases can have the same value.

Section A

1. What is the function of default in switch statement?
[ICSE 2005]
2. Write down the syntax of switch case. [ICSE 2007]
3. What is the purpose of break statement?
4. Re write the following using switch case
int n=0,ch;
if(ch==1)
{
n++;
System.out.println(n);
}
if(ch==2)
{
n+=2;
System.out.println(n);
}
if(ch==3)
{
n+=3;
System.out.println(n);
}

Section B

1. Write a menu driven program to find the area of an equlateral triangle(ET) , a right angled triangle (RT), a scalene triangle (ST)respectively.

2. Write a menu driven program to calculate the area of

circle =p*r*r

square = side * side

rectangle = length * breadth [ICSE 2005]

Display the menu to output the area as per the user's choice. For an incorrect input, appropriate message should be displayed.

Class 9 - Scanner

Input Method:

We are going to use Scanner for accepting values from the user . Its a simple one.

First include the package util.

import java.util.*;

Only small letters and * indicates all the files from the package and there is a semi colon in the end.

Then comes the main function

public static void main( )
{
Scanner S=new Scanner(System.in);

Remember S in red colour are capital letters. Here S is a variable can be in small or capital letter or any other variable name.

There are different statements for accepting different data type values.

int a= S.nextInt( );

float f= S.nextFloat( );

double x=S.nextDouble( );

But accepting character and string are different.

char ch=(char)System.in.read( );

String st=S.next( );

String st1=S.nextLine( );

next( ) accepts a word till a space and keeps the cursor in the same line.

nextLine( ) accepts words and moves the cursor to the next line after accepting the value.

Let us accept two numbers.

import java.util.*; ------------------------------------ 1

class ex1
{
public static void main( )
{
Scanner s=new Scanner(System.in); --------------- 2
int a, b,sum; --------------------------------------------- 3
System.out.println("Enter the first number"); ------ 4
a=s.nextInt( ); ------------------------------------------- 5
System.out.println("Enter the second number");----- 4
b=s.nextInt( );-------------------------------------------- 5
sum=a+b; -------------------------------------------------6
System.out.print("Total = " +sum);------------------- 7
}
}

1 is the first line in the program.

2 Write any variable instead of s , if you want.

3 is variable declaration.

4 is just a prompt message. A remainder to the user to enter a number.

5 Since I am accepting integer values, it should be nextInt. Remember no space after next and I in Int is capital.

6 is the calculation

7 is the output.

For other programs step 3 and step 5 will be different according to the data type you use.

Tuesday, 30 August 2016

Class 8 : Operators in VB

Ch : 5 Operators and Functions

In this chapter we are going to learn about the basic steps such as variable, data type, operator in Visual Basic

1. Variable :

The value is going to change every time.

x=3 , here x is a variable.

Rules for naming a variable :

1. First character should be a letter.

2. Other characters may be letter,digit.

3. No special characters except underscore( _ ).

4. Maximum limit is 255 characters.

5. Keywords are not allowed.

Examples :

1. a - Valid variable

2. s1 - Valid variable

3. Computer_Science - Valid variable

Identify the valid and invalid variables :

1. _123 - Invalid variable(Should start with an alphabet)

2. Bond007 - Valid variable

3. Cotton Boys - Invalid variable(Special character space)

4. Middle - Valid variable

5. ProgRam - Valid variable

6. A * b - Invalid variable(Special character *)