VARIABLE DECLARATION

variable declaration in program

                                     VARIABLE DECLARATION:

  Normally we take the  term variable as the value that can be change called variables, but in programming variable declaration means to assigned space in memory to the variables whether the variable is integer type, floating point or character type. Variable store data in RAM temporarily. According to the data type it takes different size in memory, when we declare a integer variable it take 2 or 4 bytes in memory same floating point take 4 or 8 bytes and character type variable take only one byte in computer memory.

  Example: int a, b, c;

 In upper example ‘int’ is the data type and a, b, are variables. Usually variable declared in the first line after program body start. But you can declare variable at any stage of program before it use.

 When we use this variable it always come to the left of assignment operator. And value or expression always comes to the right of assignment operator.

  Such as   a = 3 or   a= x +y

In above example ‘a’ is variable, ‘=’ is assignment operator and ‘3’ is value and ‘X+Y’ is expression.