Chpter 3 variables and datatypes in C.

 Chpter 3 variables and datatypes in c 

                                                                         

                              

In the last chapter we have learn about the general structure of c programming

Now we will learn about the variables and datatypes                       

In the last chapter we have learn about the general structure of c programming

Now we will learn about the variables and datatypes 

variables 

variables are like bag. where we can store the value in the form of integer, floating value or characters

suppose you want to store books, clothes and electronic gadgets. you will seperate them by different bags.

some rules for the variable declaration 

1. variables should be start from character or _.
2. variables cannot declared by begining with integer value 
3. can not use any symbol exept _
4. we cannot named variables instead of reserved keywords

these keywords are as follow

these are special keywords in c

so we need to skip them

Datatypes in c

as we are storing different things in different bags we store the value

so this types are

int

char

float

we will study about this three datatypes only

we will continue remaining datatype at later.

int it stores the value in form of integer

char it stores the value in the form of character

float it stores the value in the form of floating value like 7.9

so we will write a program for better understanding

before writing a program we need to understand some concepts

library functions

these are predefined functions used for performing some task

some examples like

printf it is used for the printing the value assigned in the double quote of printf function

scanf this function is used for taking inputs from the user

commets

comments are used for understanding of the project in the coding. suppose you have written a code six

months ago now you are reading it again. then you will get difficulties to understand the codes in c

so here comments are useful. this part is ignored by the compiler

for single line comments are used as //

for multiple lines comments are used as /*........*/

Note: You can make constant for variables in c. Means one you assigned the value in c. you can not change it.

for that you needs to add const keyword before declaring variable

code 

output 

home work programe

write a program for printing the value given by the user