WHAT ARE DATATYPES & VARIABLES ?
DEFINITION OF DATATYPE :
A Datatype is a predefined set of data items. A classification that specifies which type of value a variable has and what type of mathematical, relational & logical operations can be applied to it without causing an error.
TYPES OF DATATYPES :
1. Integer :
An integer is used for storing a numeric value i.e 0,1,2,3,4,....
Example :
int a = 5;
(where a is a variable)
2.String:
A string can store Alphabets , numbers , special characters (! @ ) .
String must be written in double quotation.
Example:
string web="WORLD TRUE SIGHT";
3.Double:
Double is same as integer i.e it stores numeric data . The only difference is it stores decimal numbers.
Example:
double num=3.22245d;
4. Float:
Float is same as DOUBLE but it stores roundoff decimal numeric data.
Example:
float num = 3.23f ;
5.Character:
Char stores characters only i-e (a , b , c, .... ) . Character must be written in single quotation.
Example:
char ch = 'a' ;
6.Boolean:
Boolean is use to store only TRUE & FALSE . Bool is used to check conditions.
Example:
bool check = "True";
WHAT ARE VARIABLES ?
In Programming variables are used to store data .
- A variable name must be meaningful .
- A variable never start with a digit but we can use the digit in the end or in between . For example :
a1b ✅
1a. ❌
- We can't use spacing between variables.
ab c ❌
- Only a special character ( _ ) is used in between , start and end of variable.
a_ ✅
a_a ✅
INITIALIZING A VARIABLE:
int age ;
string name;
float num ;
double num2;
ASSIGNING A VARIABLE:
Assigning a variable means giving the variable a proper value.
e.g :
int age= 2;
string name ="WTS";
float num=2.34f;
double num2=2.3333d;
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Hope this documentation on DATATYPES & VARIABLE is helpful for you . If you have any question regarding datatypes and variables , you are free to ask in the comment section...
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