Variables and Data Types in C

//variables in C

//variable: A name given to a memory location is called variable

//declaring variable: type variable_name;

//rules for defining a variable in C

    /*1. can contain alphabets, digits and underscore(_)

      2. a variable name can start with an alphabet and underscore only

      3. can't start with a digit

      4. whie space and reserved words are not allowed to give name of a variable  

    */

//Data types in C

    /*1. basic data type: int, char, float, double

      2. derived data type: this type of data types are created or derived by using basic data types

                            array, pointers, structure, union

      3. enumeration data type: emum

      4. void data type: void

    */

#include <stdio.h>

int main()

{

    printf("%lu", sizeof(int));

    return 0;

}