C++ notes-the difference between C and C++

The difference between C++ and C language

C language process-oriented programming language:

• When C language solves a problem, it is to follow the problem-solving steps, encapsulate functions, and then call the functions in turn according to the steps.

C++ object-oriented programming language:

• C++ is produced (inherited all the grammatical points of C language, and added object-oriented grammar rules on this basis), C++ is a superset of C language. C++ can be used for both process-oriented programming and object-oriented programming.

Language	C	C++
file type	.c	.cpp
Header file suffix	xxx.h	.h or .hpp
System header file	< stdio.h >	< cstdio>
Citation method	< string.h >	< cstring >
translater	gcc	g++

Install g++

 sudo  apt-get install  g++

Input and output in C++

• 
  It is very troublesome to output the output of C language, it needs to use the format output symbol
  C++ output is very simple (C++ can also use printf())
  == cout<<variable name ==
  Note:

  • The first one: \n --"Replace with endl

  • The second one: cout can continuously output cout<<variable 1<<variable 2<<variable 3<<endl;

  • The third: C++ encounters a char * pointer, and it is treated as a string by default, not as an address.

    The solution is to force transfer

 	char buf[10]="hello";
 	cout<<buf<<endl;  			//字符串
	cout<<(int *)buf<<endl; 	//地址

• Enter
  cin>>the name of the variable.
  Note: cin is not the address of the variable, but the name of the variable

C++ experience

The g++ compiler is very strict. A little grammatical error will appear, and a lot of information will be prompted. You only need to view the previous information, and the latter information does not need to be read (and can’t understand)