Variable declaration syntax in C++-E3 school

 In this tutorial Variable Declaration in C++.Complete guide Variable and Variable Declaration. I hope 

Easy to Understand.Best of luck.

Question :

• What are Variables?
• Difference between Variables and Data-Type?
• What is Data-Type?
• Char difference between String?

C++ Variables: 

 Variables are containers for storing data value. In c++, there are different types of variables.other types of variables two main types, Global Variable, Local Variable.

For Example:

1. Int 
2. Char
3. Bool
4. Float
5. Long 
6. String
7. Double

Difference Between Variable and Data Type:

Variables Store Information data type store specific information to be store variables 

For Example:

string name = "Jack"

Here string is a data type("string") and tells variables called name("name") to store text(Jack).

Explain Variable :

1).Int (Integer)

1. Stor Integer Whole number
2. Without decimal 
3. 123 to -123 Store 
4. 4-byte Size 

For Example

1. 1,2,12,45 are store whole number, not store point number

Not Example

1. Numbers that are not integers 1.43, 1  3/4, 3.14, are different numbers.

Double OR Float

1. Store floating-point numbers
2. with decimal
3. For Example 
4.  19.99 to -19.99
5. 8 byte

Double and Float

Same Rule but the difference only float 32-bit floating-point data_type. A double 64-bit floating-point number.

Bool:

1. Store Values with Two States 
2. Yes / NO
3.  ON /OFF
4. True /False

Long

1. store the integer data higher range 
2. 4-byte 32-bit  system 
3. 8-byte 64-bit system

For Example

• long int a=-2147483648  

Char(Character)

1. store single characters 
2. such as 'a'  or 'b'
3. Char value is surrounded by single quotes
4. 1 byte
5. -128 to 127 or 0 to 255

For example 

char letter = 'A';

String 

1.  store text
2. such as "Hello World"
3. String values are surrounded by double quotes "  -- "

For Example

1. string myText="Hello"

 store text hello

Difference Between String and Char

Char VS String

1).Char

1. #include <iostream>
2. using namespace std;
3.  
4. int main () {
5.   char myGrade = 'B';  //char only use single quotes '-------'
6.   cout << myGrade;
7.   return 0;
8. }

2).String 

1. #include <iostream>
2. using namespace std;
3.  
4. int main () {
5.   char myGrade = "B";  //char only use double 7 quotes '-------'
6.   cout << myGrade;
7.   return 0;
8. }

To understand the point.

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