Since we learned basic input function at programming with C++, we need to talk a little more about the variables. 

Variables are simply naming some data location in your pc. With variables you can store a value. 

Variables can be global, local or block based. Actually, you can use the same variable name in these locations at the same time. 

1. #include <iostream>
2. using namespace std;
3. int sameVar=1; //defining a global variable at header location
4. int main(){
5.     int sameVar=2;    //defining a local variable inside int main
6.     cout<<“local variable:”<<sameVar; //printing a local variable in int main 
7.     {
8.     int sameVar=3; //here we define a variable in any block. 
9.     cout<<“block variable:”<<sameVar; //printing the block variable
10. }
11. //reaching a global variable inside program
12. cout<<“global variable:”<<::sameVar; //we print global variable in a program
13. }

 Output;

Here the most important thing we need to talk is the 

variable = value logic. 

Always variable is on the left and the value is on the right of the equivalent sign.