PoojaMoolya at 06:41, 10 March 2017

2017-03-10T06:41:25Z

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Sandhya.np14 at 05:33, 19 November 2015

2015-11-19T05:33:49Z

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Sandhya.np14 at 01:13, 29 October 2015

2015-10-29T01:13:05Z

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Pratik kamble at 09:56, 10 July 2014

2014-07-10T09:56:53Z

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Shruti arya at 04:58, 30 June 2014

2014-06-30T04:58:02Z

PoojaMoolya at 11:33, 20 June 2014

2014-06-20T11:33:50Z

PoojaMoolya at 11:33, 20 June 2014

2014-06-20T11:33:05Z

Devraj at 11:31, 20 June 2014

2014-06-20T11:31:29Z

PoojaMoolya: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00.01 | Welcome to the Spoken Tutorial on Arithmetic & Relational Operators in '''Ruby.''' |- | 00.06 | In this tutorial we…'

2014-06-04T05:47:46Z

Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00.01 | Welcome to the Spoken Tutorial on Arithmetic & Relational Operators in '''Ruby.''' |- | 00.06 | In this tutorial we…'

New page

{| border=1
|| ''Time'''
|| '''Narration'''

|-
| 00.01
| Welcome to the Spoken Tutorial on Arithmetic & Relational Operators in '''Ruby.'''

|-
| 00.06
| In this tutorial we will learn about

|-
| 00.08
| Arithmetic Operators

|-
| 00.10
| Operator Precedence

|-
| 00.12
| Relational Operators

|-
| 00.14
| Here we are using ''Ubuntu Linux '''version 12.04 '''Ruby''' 1.9.3

|-
| 00.23
| To follow this tutorial you must know how to use Terminal and Text editor in Linux.

|-
| 00.28
| You must also be familiar with '''irb '''

|-
| 00.31
|If not, for relevant tutorials, please visit our website

|-
| 00.34
|Now let us learn about arithmetic operators.

|-
| 00.38
| '''Ruby''' has following arithmetic operators.

|-
| 00.42
|+ Addition: eg. a+b.

|-
| 00.45
| - Subtraction: eg. a-b.

|-
| 00.48
|/ Division: eg. a/b.

|-
| 00.51
|* Multiplication: eg. a*b.

|-
| 00.55
| % Modulus: eg. a%b.

|-
| 00.59
|** Exponent : eg a**b

|-
| 01.04
|Let us try these arithmetic operators using '''irb.'''

|-
| 01.08
| Open the terminal by pressing ''' Ctrl, Alt''' and ''' T '''keys simultaneously.

|-
| 01.14
|A terminal window appears on your screen.

|-
| 01.17
| Type ''' irb''' and press Enter to launch the ''' interactive Ruby. '''

|-
| 01.21
|Type 10 plus 20 and press '''Enter. '''

|-
| 01.25
|The addition operation is performed and the result 30 is displayed.

|-
| 01.31
|Similarly the subtraction and multiplication operations can be performed.

|-
| 01.35
| Let us try the division operator.

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| 01.38
|Type '''10 slash 4'''

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| 01.40
| and press '''Enter. '''

|-
| 01.42
| Here you can see the result is truncated to the nearest whole number which is 2.

|-
| 01.47
| To get a more accurate answer, we need to express one number as '''float'''

|-
| 01.52
|Type '''10.0 slash 4'''

|-
| 01.56
|and press '''Enter. '''

|-
| 01.58
| Now we get the result as 2.5

|-
| 02.01
| Let's now try the ''' modulus''' operator.

|-
| 02.05
| The '''modulus''' operator returns the remainder as output.

|-
| 02.09
| Type '''12 percentage sign 5''' and press '''Enter'''

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| 02.15
|Here 12 is divided by 5 and the remainder 2 is returned back.

|-
| 02.21
| Now let's try the '''exponent''' operator.

|-
| 02.24
| Type ''' 2 followed by the asterisk symbol twice and then 5''' and press '''Enter. '''

|-
| 02.32
|This means that 2 is raised to the power of 5.

|-
| 02.36
| So we get the output as 32.

|-
| 02.39
|Next, let us learn about operator precedence.

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| 02.44
| When several operations occur in a mathematical expression,

|-
| 02.47
| each part is evaluated

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| 02.50
|and resolved in a predetermined order called '''operator precedence'''.

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| 02.56
| This means that the operator which has ''' highest priority''' is executed first.

|-
| 03.01
|This is then followed by the next operator in the ''' priority''' order and so on.

|-
| 03.07
|This slide lists all operators from highest precedence to lowest.

|-
| 03.13
| For example ''' 3 + 4 * 5 ''' returns 23 and not 35

|-
| 03.23
|The multiplication operator (*) has higher precedence than the addition operator (+)

|-
| 03.29
| and thus will be evaluated first.

|-
| 03.32
|Hence four fives are twenty and then three is added to 20 to give the output as 23

|-
| 03.42
|Lets us see some more examples based on operator precedence.

|-
| 03.47
| Let's go back to the terminal.

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| 03.50
|Press ''' Crtl and L''' keys simultaneously to clear the irb console.

|-
| 03.56
| Now type '''7 minus 2 multiply by 3 '''

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| 04.03
| and press '''Enter '''

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| 04.05
| We get the answer as 1.

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| 04.08
| Here the ''' asterisk''' symbol has higher priority than the '''minus''' sign.

|-
| 04.13
|So the multiplication opertion is performed first and then subtraction is performed.

|-
| 04.20
| Lets us see an another example.

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| 04.22
| Type Within brackets '''10 plus 2 slash 4 '''

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| 04.29
|and Press '''Enter '''

|-
| 04.30
| We get the answer as 3.

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| 04.33
|In this case () bracket has the higher priority than division (slash)

|-
| 04.39
| So the operation inside the bracket that is ''' addition''' is performed first.

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| 04.44
| Then ''' division''' is performed.

|-
| 04.47
| Now, let us learn about Relational Operators.

|-
| 04.51
|Let's switch back to slides.

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| 04.54
| Relational operators are also known as '''comparison''' operators.

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| 04.59
| Expressions using relational operators return '''boolean''' values.

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| 05.04
|Relation Operators in '''Ruby''' are

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| 05.07
|''' == Equals to''' Eg. '''a==b '''

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| 05.14
| ''' dot eql question mark''' Eg. '''a.eql?b '''

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| 05.21
|!= ''' Not equals to''' Eg. ''' a exclamation equal b'''

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| 05.28
| ''' Less than Eg. a<b'''

|-
| 05.32
| '''Greater than Eg. a>b'''

|-
| 05.37
| ''' <= Lesser than or equal to Eg.a less than arrow equal b'''

|-
| 05.44
|''' >= Greater than or equal to Eg.a greater than arrow equal b'''

|-
| 05.49
|''' <=> Combined comparison Eg.a less than arrow equal greater than equal b'''

|-
| 05.56
| Now let us try some of these operators.

|-
| 06.00
|Go to the terminal.

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| 06.02
| Press ''' ctrl, L''' keys simultaneously to clear the '''irb''' console.

|-
| 06.09
| Lets us try ''' equals to''' operator.

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| 06.11
|So type ''' 10 equals equals 10 '''

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| 06.16
|and Press ''' Enter'''

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| 06.17
|We get the output as ''' true.'''

|-
| 06.20
|''' .eql?''' opeartor is same as ''' equals to''' operator.

|-
| 06.24
|Lets try it out

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| 06.25
| Now type ''' 10 .eql?10''' and Press Enter

|-
|06.33
|We get the output as ''' true'''

|-
| 06.35
|Now lets try ''' not equal to''' operator.

|-
| 06.39
| Type ''' 10 not equal 10'''

|-
|06.44
| And Press ''' Enter'''

|-
| 06.46
|We get the output as ''' false.'''

|-
| 06.48
|This is because the two numbers are equal.

|-
| 06.51
|Clear the ''' irb''' console by pressing '''Ctrl, L''' simultaneously.

|-
| 06.56
| Let us now try ''' less than''' operator.

|-
| 07.00
|Type ''' 10 less than 5''' and Press Enter

|-
| 07.05
| Here if first operand is less than second then it will return ''' true'''

|-
| 07.10
|otherwise it will return ''' false'''

|-
| 07.14
|We get the output as ''' false''' because 10 is not less than 5

|-
| 07.19
| We will now try '''greater than''' operator
|-
| 07.22
| Type '''5 greater than 2'''

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| 07.26
|Here if first operand is greater than second then it will return '''true '''

|-
| 07.31
|otherwise it will return '''false '''

|-
| 07.34
|Press ''' Enter'''

|-
| 07.36
| In this case, we get the output as True because 5 is indeed greater than 2

|-
| 07.42
|Clear the '''irb''' console by pressing ''' Ctrl, L''' simultaneously

|-
| 07.47
| We will now try the '''less than equal to''' operator

|-
| 07.51
| Type '''12 less than equal 12 '''

|-
| 07.56
|and Press '''Enter '''

|-
| 07.59
| Here if first operand is less than or equal to second then it returns '''true'''

|-
| 08.04
| otherwise it returns '''false '''

|-
| 08.07
|We get the output as '''True''' because 12 is equal to 12

|-
| 08.11
|You can try out the ''' greater than or equal to''' operator likewise.

|-
| 08.15
|Now let's try the '''combined comparision''' operator.

|-
| 08.19
|The ''' combined comparision''' operator

|-
| 08.21
|Returns '''0''' if first operand equals second

|-
| 08.24
|Returns 1 if first operand is greater than the second and

|-
| 08.29
|Returns -1 if first operand is less than the second operand

|-
| 08.34
|Let's see how it works with an example

|-
| 08.36
|Type '''3 less than equals greater than 3 '''

|-
| 08.41
|And Press '''Enter '''

|-
| 08.43
|We get the output as 0

|-
| 08.45
|because both the operands are equal i.e. both are three

|-
| 08.50
|Now, let's change one of the operands to 4

|-
| 08.53
|Type '''4 less than equals greater than 3 '''

|-
| 08.58
|And Press '''Enter '''

|-
| 08.59
|We get the output as 1

|-
| 09.01
|Since 4 is greater than 3

|-
| 09.04
|Now, let's change this example again

|-
| 09.07
|Type '''4 less than equals greater than 7 '''

|-
| 09.11
|And Press '''Enter '''

|-
| 09.13
|We get the output as -1

|-
| 09.14
|Since 4 is less than 7

|-
| 09.17
|As an assignment

|-
| 09.19
|Solve the following examples using irb and check the output

|-
| 09.24
|''' 10 + bracket 2 astreisk 5 bracket 8 slash 2'''

|-
| 09.32
|'''4 astreisk 5 slash 2 plus 7'''

|-
| 09.37
|Also, try arithmetic operators using methods

|-
| 09.42
|This brings us to the end of this Spoken Tutorial.

|-
| 09.45
|Let's summarize

|-
| 09.47
|In this tutorial we have learnt about

|-
| 09.49
|Arithmetic Operators plus minus astreisk slash standing for addition, subtraction, multiplication, division.

|-
| 09.59
|Operator Precedence

|-
| 10.01
|Relational Operators

|-
| 10.04
|using many examples

|-
| 10.06
| Watch the video available at the following link.

|-
| 10.10
|It summarises the Spoken Tutorial project.

|-
| 10.14
|If you do not have good bandwidth, you can download and watch it.

|-
| 10.18
| The Spoken Tutorial Project Team :

|-
| 10.20
|Conducts workshops using spoken tutorials

|-
|10.23
|Gives certificates to those who pass an online test

|-
| 10.26
|For more details, please write to contact@spoken-tutorial.org

|-
| 10.32
| Spoken Tutorial Project is a part of the Talk to a Teacher project.

|-
| 10.36
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.

|-
| 10.43
|More information on this Mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro

|-
| 10.51
|This script has been contributed by the spoken tutorial team IIT Bombay

|-
| 10.57
|And this is Anjana Nair signing off Thank you

|}

@@ Line 326: / Line 326: @@
 |-
 | 05.49
-|'''  <=> Combined comparison Eg.a less than arrow equal greater than equal b'''
+|'''  <=> Combined comparison Eg.a less than arrow equal greater than arrow b'''
 |-

@@ Line 310: / Line 310: @@
 |-
 |  05.28
-| ''' Less than  Eg. a<b'''
+| ''' Less than  Eg. a < b'''
 |-
 |  05.32
-|'''Greater than  Eg. a>b'''
+|'''Greater than  Eg. a > b'''
 |-

@@ Line 60: / Line 60: @@
 |-
 | 00.48
-|/ Division: eg. a/b.
+|'''/''' Division: eg. a/b.
 |-

Ruby/C2/Arithmetic-and-Relational-Operators/English-timed - Revision history

PoojaMoolya at 06:41, 10 March 2017

Sandhya.np14 at 05:33, 19 November 2015

Sandhya.np14 at 01:13, 29 October 2015

Pratik kamble at 09:56, 10 July 2014

Shruti arya at 04:58, 30 June 2014

PoojaMoolya at 11:33, 20 June 2014

PoojaMoolya at 11:33, 20 June 2014

Devraj at 11:31, 20 June 2014

PoojaMoolya: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00.01 | Welcome to the Spoken Tutorial on Arithmetic & Relational Operators in '''Ruby.''' |- | 00.06 | In this tutorial we…'