Number Systems

Very Short Answers

1. What is data?

The term data comes from the word datum, which means a raw fact. The data is a fact about people, places or some objects.

E.g.: Let 'Name', 'Age', 'Class', 'Marks' and 'Subject' be some defined variables. Now, let us assign a value to each of these variables.

Name = Rajesh

Age = 16

Class = XI

Mark = 65

Subject = Computer Science

In the above example, the values assigned to the five different variables are called data.

2. Write the 1’s complement procedure.

Step 1: Convert given Decimal number into Binary

Step 2: Check if the binary number contains 8 bits, if less add 0 at the left most bit, to make it as 8 bits.

Step 3: Invert all bits (i.e. Change 1 as 0 and 0 as 1)

3. Convert (46)₁₀ into Binary number

4. We cannot find 1’s complement for (28)_10. State reason.

Ø 1's complement representation is an easier approach to represent signed numbers. This is for negative numbers only.

Ø This (28)₁₀, this whole numbers cannot be determined by negative number because the number whose MSB is 1.

5. List the encoding systems for characters in memory.
There are several encoding systems used for computer.

They are

(ii) BCD: Binary Coded Decimal.

(iii) EBCDIC: Extended Binary Coded Decimal Interchange Code.

(iv) ASCII: American Standard Code for Information Interchange.

(v) Unicode: Unicode is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems.

(vi) ISCII: Indian Standard Code for Information Interchange