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C++ Variables

In C++ Programming language variable is used to store data in memory location.

Rules of Declaring variables in C++

  • Variable name can consist of Capital letters A-Z, lowercase letters a-z, digits 0-9, and the underscore character.
  • The first character must be a letter or underscore.
  • Blank spaces cannot be used in variable names.
  • Special characters like #, $ are not allowed.
  • C++ keywords can not be used as variable names.
  • Variable names are case sensitive.
  • A variable name can be consist of 31 characters only if we declare a variable more than 1 characters compiler will ignore after 31 characters.

Variable Definition in C++

type variable_name;
type variable_name, variable_name, variable_name;
/* variable definition and initialization */
int    width, height=5;
char   letter='A';
float  age, area;
double d;

/* actual initialization */
width = 10;
age = 26.5;

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