variable and keyword in C++.

what is variable in c++?

                           An entity that may vary during program execution is called variable. variable name in c++ programming is the name of location in memory . different type of variable use in c++ programming. e.g integer variable etc certain type can hold certain value. mean integer variable can hold integer value.

RULES FOR CONSTRUCTION VARIABLE NAME:

1) A variable is combination of alphabets, digits or underscores.

2)first character of variable must be alphabet or underscore.

3) No commas or blank space are allow in variable.

4)No special symbol and character can be use within variable name expect underscore,

5)C++ keyword can not be use as c++ variable 

 Example of variable name:

                                            s_name                //valid 

                                            _val                    //valid

                                            4name              //invalid because first character must be alphabet or underscore

                                            int                    //invalid because it is c++ keyword

                                        

keyword in c++:

                                 keyword are the words whose meaning already been explained in c++ compiler.

list of keyword in c++: