Coding Decoding

Category : 4th Class

 

Coding Decoding

 

 

 

OBJECTIVES

 

·      Students will develop the ability to understand the logic that cots a particular message to read the message. 

 

 

 

INTRODUCTION

 

A code means arrangement of letters. Therefore, coding is a method of transforming any instruction from the given form to the required form.

 

 

 

CODING

 

A particular code patterh is used to express a word in English language to express it as a different word. The coded word itself does not make any sense unless we know the code, i.e. unless we know the pattern or code that has been followed.

 

 

 

DECODING

 

Decoding helps in tracing out the actual meaning of a coded letter/word sentence.

 

 

 

TYPES OF CODING

 

1.  Letter Coding

2.  Number Coding

3.  Substitution Coding

4.  Sentence Coding

5.  Symbols Coding

 

 

Letter Coding

 

In these questions, code values are given to a word in terms of letters. A particular letter stands for another letter in letter coding.

 

 

          Examples:

 

                    1.         In a certain code language, TEACHER is written as VGCEJGT, then how will CHILDREN be written in that code language?

(a) ENAGITEV                           (b) PGTFNKJE

(c) EJKNFTGP               (d) MGAETVIE

 

                 Ans.     (c)

Explanation:

Similarly,

Hence, answer is (c).

 

 

 

 

Number Coding

 

In these questions, either numerical code values are assigned to a word or alphabetical code values are assigned to numbers.

 

                 2.         If in a certain code ROPE is coded as 6821, CHAIR is coded as 73456 what will be code for CRAPE?

(a) 73456                       (b) 76421       

(c) 77246                       (d) 77123

 

           Ans.     (b)

Explanation:

The alphabets are coded as follows:

R

O

P

E

C

H

A

I

6

8

2

1

7

3

4

5

So, CRAPE is coded as 76421, so the answer is (b).

 

 

 

Substitution Coding

 

In this type of questions, a particular word is assigned to. a certain substituted name and a question is asked to be answered in that. Substituted name.

 

                    3.         If sky is star, star is cloud, cloud is earth, earth is. free and tree is book, then where do the birds fly?

(a) Star                          (b) Sky         

(c) Cloud                       (d) Earth

 

                 Ans.     (a)                  

Explanation:

In reality birds fly in the sky but in this question, as given sky is called star. So, star is the answer.

 

 

 

Sentence Coding

 

In this type of questions, a group of words will be coded.

 

          4.         If 'drink fruit juice' is written as 'tee see pee', 'juice is sweet' is written as 'see kee lee' and 'he is intelligent' is written as 'lee ree mee'. What will be the code for 'sweet' in that code language?

(a) see                           (b) kee         

(c) pee                           (d) lee

 

Ans.     (b)

Explanation:

     

is          \[\xrightarrow{{}}\]      lee

juice      \[\xrightarrow{{}}\]         see

sweet     \[\xrightarrow{{}}\]  kee

 

In first and second step we get the code of juice' which is 'see'. In the same manner, from second and third step we get the code of is' which is 'lee'. In the second step, the remaining word is "sweet' and the remaining code is "kee".

Hence, answer is (b).

 

 

 

 

Symbols Coding

 

In this type of questions, either alphabetical code values are assigned to symbols or symbols are assigned to alphabets.

            5.         In a certain code 'TOME' is written as '@  @ ?              (b) @ ? *  @ ?                  (d) None of these

 

Ans.     (c)

Explanation:

From the data we have

Hence, REMOTE is coded as £ ? * $ @ ?

So, (c) is the answer.

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