Concepts

Computer Science - Class 11
Chapter 2 Class 11 - Encoding Schemes and Number System

## Number System and Conversion

A number system is a method to represent numbers. There are 4 types of  number systems. They are:

### 1. Decimal Number System

This number system is used in our day to day lives.

The Decimal Number system contains digits from 0 to 9 . So the base of the decimal number system is 10.

Examples:

• (1234) 10
• (89.10) 10

### 2. Binary Number System

The Binary Number system contains two digits 0 and 1 . So the base of the binary number system is 2.

Examples:

• (1010) 2
• (111.101) 2

### 3. Octal Number System

The Octal Number system can contain digits from 0 to 7 . So the base of the octal number system is 8.

Examples:

• (561) 8
• (12.167) 8

The Hexadecimal Number system can contain digits from 0 to 9 and alphabets from A to F . So the base of the hexadecimal number system is 16.

Examples:

• (A89) 16
• (CD.117) 16

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