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This article introduces the relevant knowledge of "what are the most basic rules of C++". In the operation of practical cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. All C++ programs must have a main () function, which is the beginning of program execution.

two。 All variables must be declared before use

3. C++ supports many data types, including integer and floating point types.

4. The output operator is used with the cin statement to read information from the keyboard

6. The program ends when it reaches the end of the function main ()

7. All functions are independent entities. Functions cannot be nested within each other, but can be called each other (except for the main () function).

8. Representation of a function: the name of the function is followed by parentheses

9. The form of the calling function: first the function name, followed by a pair of parentheses, and * * is the semicolon

10. When a function needs a parameter, the parameter is placed in parentheses after the function name

11. Usually when you use a library function, you must include the header file where the function is located in the program, because the header file provides the prototype of the library function.

twelve。 The actual parameter (argument) is the value passed to the function when the function is called, and the formal parameter (parameter) is the variable defined by the function to receive the actual parameter.

13. The term "actual parameters" in C++ (also referred to as parameters for short) refers to the values used to call the function, and the variables that receive these values are called formal parameters. In fact, functions with actual parameters are often called parameterized functions (parameterized function)

14. Remember, use void to declare only if the function does not return a value

15. Standard C++ does not use the "default to integer type", so you should explicitly specify the return type of each function.

16. If chooses between two execution paths

17. + + is the increment operator, which adds 1 to the Operand and is the decrement operator, which subtracts the Operand by one

18. Code blocks are logically related statement units. Using code blocks to implement the algorithm can make the idea of the algorithm clearer and more efficient.

19. It is recommended to use indentation format when writing programs: indent the code after the opening braces, and restore the indented format of the code to the format before the opening braces after writing the closing braces

20. Remember, the size of the keyword makes sense. C++ is a case-sensitive language, which requires that all keywords must be lowercase

Learning C++ should be from easy to difficult, step by step, for beginners with zero foundation, you should calm down and not be impatient. To become a master of C++, it is not so easy, you must spend a lot of effort.

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