Difference between revisions of "Ruby/C2/Arithmetic-and-Relational-Operators/English-timed"

| Arithmetic Operators  

| Operator Precedence  

|Relational Operators.

|  Here we are using: '''Ubuntu Linux '''version '''12.04''' , '''Ruby 1.9.3'''

|  You must also be familiar with ''''irb'.'''

| '''Ruby''' has the following arithmetic operators.  

|'+' Addition, e.g. a+b.  

|  '-' Subtraction, e.g. a-b.  

| '/' Division, e.g. a/b.  

| '*' Multiplication, e.g. a*b.  

| '%' Modulus, e.g. a%b.  

| '**' Exponent,  e.g. a**b.  

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

|A '''terminal window''' appears on your screen.  

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

|Similarly, the subtraction and multiplication operations can be performed.  

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

|  For example, ''' 3 + 4 * 5 ''' returns 23 and not 35.  

|The multiplication operator asterisk (*) has higher precedence than the addition operator plus (+)  

|  Let's go back to the terminal and

|press ''' Crtl, L''' keys simultaneously to clear the '''irb''' console.  

|and press '''Enter'''. We get the answer as 3.

|Let's switch back to the slides.  

| ''' == Equals to''',  e.g. a==b  

| ''' dot eql question mark'''  e.g. a.eql?b  

| '''!=  Not equals to'''  e.g. '''a exclamation equals b'''  

| '''< Less than''' e.g. a < b  

| '''> Greater than''' e.g. a > b  

| ''' <= Lesser than or equal to  e.g. a less than arrow equals b'''  

| ''' >= Greater than or equal to''' e.g. a greater than arrow equals b  

| '''  <=> Combined comparison''' e.g. a less than arrow equal greater than arrow b.  

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

|and press '''Enter'''. We get the output as "true".

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

|Let's try it out. Now, type ''' 10 .eql?10''' and press '''Enter'''.

|We get the output as "true".

|We get the output as "false".

|  Now, let us try ''' less than''' operator.  

|  Here, if first operand is less than second then it will return "true".

|Otherwise, it will return "false".   

|We get the output as "false" because 10 is not less than 5.

|Here, if first operand is greater than second then it will return "true";

|otherwise it will return "false".

| In this case, we get the output as "true" because 5 is indeed greater than 2.

| Here, if first operand is less than or equal to the second then it returns "true";

| otherwise it returns "false".

|We get the output as "true" because 12 is equal to 12.

| Returns 0 if first operand equals second  

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

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

|and press '''Enter'''.We get the output as 1  

|We get the output as -1. Since 4 is less than 7.  

|''' 10 +  bracket 2 asterisk 5 bracket 8 slash 2'''

| '''4 asterisk 5 slash 2 plus 7'''

| Also, try arithmetic operators using '''method'''s.  

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

| Operator Precedence  

| Relational Operators  

| using many examples.  

|It summarizes the Spoken Tutorial project.

| Conducts workshops using spoken tutorials.  

| Gives certificates to those who pass an online test.  

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

|More information on this mission is available at: spoken hyphen tutorial dot org slash NMEICT hyphen Intro.