Difference between revisions of "Java/C2/Relational-Operations/English-timed"

|   Welcome to the spoken tutorial on '''Relational Operators in Java'''.

| ''' boolean data type'''

 

| '''Relational operators '''and

|  how to '''compare data '''using '''Relational operators.'''

|  For this tutorial, we are using  

 

'''Ubuntu 11.10''',  

 

|  If not, for relevant tutorials, please visit our  website   as shown.

| Relational operators are used to check for conditions.

 

| Their output is a variable of '''boolean''' data type

|  '''True '''or '''False. '''

|  '''True''' is the output when the condition is true.

|  '''False''' is the output if the condition is not true.  

|  Here is a list of the Relational operators available.

| * greater than

| * less than

| 01:13 

| 00:14

| * greater than or equal to

|  * less than or equal to

| * not equal to

| We shall look into each of them in detail.

| Switch to '''Eclipse.'''

|   Here we have the '''Eclipse IDE '''and the skeleton required for the rest of the code.

| I have created a class '''BooleanDemo''' and added the '''Main method'''.

| Now let us add some expressions.

|  This statement says check if the value of variable is greater than 40 and store the result in 'b';

|  Now Let us print the value of 'b'.

|   03:20

| Similarly, ''less than'' symbol is used to check if one value is ''less than'' the other.

| 03:37

| let us change the''greater than'' to ''less than symbol.''

|   So, We are checking if the value of '''weight''' is less than '''40'''.

|   '''Save''', '''Run'''.   

| 03:56

| As we can see, the output is '''True''' as expected.

|  We see that we get a '''False''' because the condition,

|  To do that, we use '''two equal to symbols.'''

|  As we can see, the output is '''False''' because the value of '''weight''' is not equal to '''40'''.

|  And this gives unnecessary errors.

|  As we can see, the output is '''true ''' because '''weight''' is greater than '''40'''

| 07: 16

| Let us change weight to a value less than 40. Let's say 30.

|  Change ''greater than'' to ''exclamation ''.

|  So this statement says check if the value of '''weight''' is not equal to '''40''' and store the result in '''b'''.

| 08:16

|   As we can see, the output is '''true''' because the values of weight is not equal to 40.

| 08:23

| Let us change the weight to 40 and see the output.

| Change 30 to 40.

| '''Save, Run'''.

|   We get a '''false''' because the condition '''weight''' not equal to 40 is false.

| This is how we use the various relational operators to compare data in Java.

| 08:58

| This brings us  to the end of this tutorial.  

| In this tutorial we have learnt about: the boolean data type

|  the relational operators and

|   09:13

| As an assignment for this tutorial, find out if the two expressions shown are equivalent.

 

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|   09:36

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