Declaration of Variables in C++

How to Declare the Variables in C++? or What is the Declaration of Variables?

C++ allows the declaration of a variable anywhere in the scope. This means that a variable can be declared right at the place of its first use.  This makes the program much easier to write and reduce the errors. 

Example: 

int main()

{

float x;

float sum = 0;                                 //declaration

 for(int i=1; i<5; i++)                       //declaration

{

                       cin>>x;

                       sum = sum + x;

}

float average;

              average= sum/i;                                 //declaration

              cout<<average;

              return 0;

}