[Foundation and theory] C # variables

Variables related to the stored data, the data can be placed in the variable, the variable may be removed from the data or view thereof.

---

While all the data in the computer are in fact the same thing (a set of 0 and 1), but have different connotations variable, called type.

---

C # syntax definition of a variable is specified and the type and variable names in the following format:

// <type> <name>;
 // For example, the definition of an integer type, named Number 
int Number; // Remember semicolon

 Use variable is not defined before (find either variable xxx) or using unassigned variables will complain!

---

Simple types, the type substantially consisting of the application member. There is no simple type and sub-type characteristics. Most simple types are stored values.

---

Simple types - integer type:

 

 Above type top right to bottom, from small to large. Large type can contain small type.

---

Simple types - text and Boolean type:

No upper limit on the number of characters in the string, because it can use variable-sized memory.

---

Variable naming rules:

1. The first letter of the variable name must be a letter, underscore (_) or @
2. Subsequent characters can be letters, numbers or an underscore

---

Literals