Shulou(Shulou.com)06/03 Report--

This article mainly shows you "what are the key knowledge of Thinking in C++". The content is simple and easy to understand and clearly organized. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn this article "what are the key knowledge of Thinking in C++".

Thinking in C++ Chapter 2Translator:

Interpreter

compiler

Compiler compiler steps:

preprocessor processes preprocessed instructions

Compiling is divided into two passes, the first pass parses the number of preprocessing code generation nodes, global optimizer is performed before the second step, and the second pass code generator parses the code tree to generate machine language or assembly language.

Static type checking is done in the first pass

declaration and definition of function or variable void function();//declaration void function(){}//definition extern int a;//declaration int a;//definition connection

The final stage of the compilation process, where the compiler-generated object modules are concatenated into executable files (recognizable to the operating system).

Thinking in C++ Chapter 3 Function Return Description

return statement exits the function, returns to the point after the function call, associates stack operations

Common function library

Object modules are managed by the library manager, which is the one that manages.lib/.a files.

for (initialization;conditional;step)

For loop: first, execute initialization, then judge conditional, enter loop if condition is satisfied, and then proceed to step after executing loop.

switch(selector){ case integral-value:statement;break; ... defualt:statement;}

selector in switch must be an integer value, integral-value must be an integer value

selector can also be a value of type enum

specifier

Used to change the meaning of the base built-in type and expand the base type into a larger set

1. int: short int / int / long int(int keyword can be omitted when using short and long)

2. float/double: no long float only long double, i.e. float / double /long double

3. signed/unsigned: sign bit (for plastic and character types)

void* pointer description

void* pointer can be assigned to any type of address, but type information is lost, improper type conversion can cause the program to crash

Valid scope of variable

From the point of definition to the first closed parenthesis of the closest open parenthesis pair before the variable is defined, that is, the scope is determined by the closest parenthesis pair in which the variable is located.

global variables

Global variables have a life cycle until the end of the program. You can use the extern keyword to use global variables in another file.

static variable

static variable has that advantage that it is unavailable outside the scope of the function, cannot be easily changed, localize errors, and when static is applied to function names and all variables outside the function, it mean "the name may not be used outside the file," i. e., has file scope such as

//file1.cppstatic int fs;int main(){ fs = 1;} //file2.cppextern int fs;//compiler will not find fs in file1.cpp file, i.e. file scope void function(){ fs = 100;}extern static int i;int main(){ cout

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.