Class 8 - Operators

Ch : 5 Operators and Functions

In this chapter we are going to learn about the basic steps such as variable, data type, operator in writing a program.

 

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 *)