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Variables

  • Fandi Susanto
  • 14 November 2013 at 17:13
  • C Sharp
  • 265
  • 87
  • United States
 


Author: Fandi Susanto Language: United States
License: Freeware
Size: 0 KB
Downloads: 20 times

 

A variable is just a storage for data of values in the program. In programming world, every variables has a datatype and in most programming language, C# included, a variable's datatype is determined when the variable is declared or initialized. There are several ways to declare a variable:


  • [data type] [identifier];
  • [data type] [identifier] = [value];
  • [data type] [identifier 1], [identifier 2], [identifier N];
  • [data type] [identifier 1] = [value 1], [identifier 2] = [value 2], [identifier N] = [value N];

For example:

  • int totalItemCount;
  • string customerName = Fandi;
  • double price1, price2, price3;
  • int amount1 = 10, amount2 = 7, amount3 = 12;

The first and third example above only declare variables, they don't assign any value to the variables. An empty variable must be assigned a value before being read. If an empty variable is read, a runtime error will occur. While the second and fourth example have already assigned values to the variables so that the variables are ready to be read. If a variable is empty when being read, a runtime error will occur.


The datatypes used above are the most common datatype used, int is an integer, string is a collection of characters, and double is a real number. We will learn about datatypes in the next part of this tutorial.

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