LinuxC ++ self-study

LinuxC ++: Linux general technology-Linux programming and kernel information. For more information, see the following section. Problem:

In linux, does C ++ use a standard C ++ library?
In linux, the standard C ++ library is used.
Appendix: The C ++ compiler used in Suse linux is g ++ (gcc)
The C ++ compiler used by IBM_AIX Unix is cc.
The C ++ compiler used by Sun Unix is CC.

Is C ++ an API written in C language called by the system in linux?
The API written in C language is useless !~! The database has been changed. C ++ is compatible with C, and the database is no exception.

Is there a basic library similar to MFC in linux?
This class library does not exist in linux!
If 1 and 2 are positive and 3 are negative in the above three questions, I personally think VC and MFC do not need to be read! If linux/unix does not use middleware (similar to the MFC stuff) or some APIs, such as SQLAPI, it is generally pure C/C ++ programming.

Start:

1. compile C-"Hello world !"
# Include
Void main ()
{
Printf ("Hello, world! \ N ");
}
The disk is saved as hello. c.
Enter g ++ hello. c-o hello (case sensitive) in the command line)
Run./hello
Hello world!

2. compile C ++-"Hello world !"
# Include
Using namespace std;
Int main ()
{
Cout <"Hello world !" <Endl;
Return 0;
}
Compile the C ++ program with g ++
G ++ hello. cpp-o hello

3. Compilation class
There are three files: Hello. h, Hello. cpp, and MyFirst. cpp. The content is as follows:
File: // Hello. h
# Ifndef HelloH
# Define HelloH

Class Hello
{
Hello ();
Void Display ();
}

File: // Hello. cpp
# Include "Hello. h"
# Include

Hello: Hello ()
{
}

Hello: Display ()
{
Cout <"Hello world !" <Endl;
}

File: // MyFirst. cpp
# Include
# Include "Hello. cpp"

Int main ()
{
Hello theHello;
TheHello-> Display ();

Return 0;
}
Compile: g ++ MyFirst. cpp-o MyFirst

4. Multi-file compilation links
Gcc has the-c parameter and can only compile without Link
Therefore, the above program can be compiled in the following order

G ++-c hello. cpp-o hello. o
G ++-c MyFirst. cpp-o MyFirst. o
G ++ MyFirst. o hello. o-o MyFirst

Of course, there are simpler methods: g ++ hello. cpp MyFirst. cpp-o MyFirst. cpp

A project usually has hundreds of source programs, so the connection will be exhausted,
You can write the above compilation process as a text file
Makefile in Linux

# File description
MyFirst: MyFirst. o hello. o
G ++ MyFirst. o hello. o-o MyFirst

Hello. o: hello. cpp
G ++-c hello. cpp-o hello. o

MyFirst. o: MyFirst. cpp
G ++-c MyFirst. cpp-o MyFirst. o

Save disk as MyFirst
In command mode: make MyFirst

2. debugging
Gdb./file name
The following are the commands that may be used in debugging (you can enter only the first character, for example, break is abbreviated as B ).

Indicates
List <show source code>
Break row number <set breakpoint>
Run <running program>
Continue <continue running from the breakpoint>
Print variable <view the variable value during debugging>
Del row number <Delete breakpoint>
Step <one-step execution, which can be tracked inside the function>
Next <one-step execution, not tracked inside the function>
Quit <exit>