1.C language naming rules
Character sequence of letters (az, AZ) numbers (0-9) or underscore (_) configuration -
- The first character must be a letter or an underscore (not digital)
- case-sensitive (such as: name and Name are two names)
2. Question: How to change the value of the variable represented?
Analogy:
- variables like life in the glass, then, as long as the situation does not overflow, variables can represent any value
- glass of wine may be increased or decreased at any time, the value of variable representation can be changed at any time
3. The program variable assignment
- Definition: The change represents a variable worthy of operation is called the assignment operator
- Example:
4. The variable initialization program
- Definition: while creating variable display specify an initial value
- Example:
Highlighted (focus)
- Assignment program (=) in the amount equal to not mathematics
- the initial value of the specified operation is called initialization of variables simultaneously creating (int i = 1;)
- Creating variable operation after changing its value is called the assignment (int i; i = 1;)
- no initialization of variables, which is a random value
- agreed saying: Create a variable "=====" defined variables
Programming Experiment: Initialization and assignment variables
3. Summary
- names must follow the rules, otherwise it will compile error
- You can change the value of their representatives after the definition of variables (assignment)
- definition of variables and can specify a value (initialization)
- initialization and the assignment of two distinct operations (although the same reference numerals)
- Assignment program (=) mathematics is completely different and equal