WAP to understand definition of variables.

//program to understand definition of variables
#include <iostream>// header file
using namespace std;//to handle all standard characters/functions,reserved words  used in program. we do not use in turboc++ compiler

int main()      // main function
{
    int number;  //declaration of variable.
     number=90;//definition of variable
    cout << "number =" <<number<< endl;
    return 0;
}