Difference between revisions of "C-and-C++/C2/Tokens/English-timed"

| Welcome to the spoken tutorial on '''Tokens-in-C-and-C-Plus-Plus'''.

| const keyword is used to create read only variable.

| We have assigned it a value of , '''1.5'''

| '''Data type '''is a finite set of values along with a set of rules

| Here, '''d '''is a '''variable'''

| '''Char''' and single quotes suggest that we are dealing with a '''character'''

| As a result, '''d''' is a '''character variable ''' storing the value ''''A''''

| It is easy to see that '''int, double float''' and char are datatypes.  

| '''a,''' '''c and d''' are '''variables'''

|We will know more about datatypes and variable

|Data types: Let us begin with integer data type

|It is declared as int

| If we want to print an integer data type , we will use %d as the format specifier  

| Similarly, we will use float and %f for floating point numbers

|For character data type, we will  use char and %c

| And For double data type, we will use double and %lf as the format specifier.

| Now we will see the range of data types

| Before using a '''variable''' it must be declared

| We should try to give meaningful names to '''variables'''

| example '''john''', '''marks''', '''sum''' etc.  

| Now we will move back to our program.

| Here,''' printf''' is the '''identifier''' name for this function

 

 

| '''Identifiers''' are user defined names

| An '''identifier '''consists of letters and digits  

| Both uppercase and lowercase letters are permitted  

| First character must be an alphabet or underscore .

|Now Come back to our program

|Now click on save.

| Let us execute the program

| To compile ,Type '''gcc space tokens dot c space hyphen o tok''' press''' Enter'''

| To execute type'''./tok'''(dot slash tok)

| Let us replace % point 2f with % point 3f

| Now Click on '''Save'''

|Now we will execute the same program in c++  

 

| Come back to our program

| I will change a few things here

| First press shift+ctrl+s keys simultaneously on your keyboard.

| Now save the file with an extension .cpp and click on save

|let us change the header file as iostream

| Now  include the '''using '''statement   

|Now replace the '''printf '''statement with the  '''cout'''  statement

| Since we use ''cout<< function''' to print a line in C++

| Click on Search for and replace text option  

| We don't need the '''format specifier''' and /n  

|Click on Save. Now delete the closing bracket  

 

| Now Click on Save

 

|To compile , type g++ space  tokens dot cpp space hyphen o space tok 1

 

| Here we have tok1 because we don't want to overwrite the output parameter tok for the file tokens.c  

| Now press Enter

| To execute.Type ./tok1 . Press Enter  

| Now Click on Save. Let us see what happens.

|Come back to our program

| This is because b is a constant. Constants are  fixed values.

|Delete this. Click on Save

| Let us execute again. Come back to our terminal

|Execute as before. Yes it is working.

| Suppose here I will miss the single quotes. Click on Save

| let us execute. Come back to our  terminal.

| we see an error at line no.9 in our tokens dot cpp file.

| And here we have declared d as a character variable.

|Now Click on Save . Let us execute .

|Come back to our terminal  

|Now Compile as before  

|Now   switch back to our slides.  

| Let us summarize  

| As an assignment

| Hint: principal * rate * time upon  100

|Watch the video available at the link shown below

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| Ashwini Patil from IIT Bombay signing off .Thank You for joining