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<>Visual Studio2019 Novice C++ course （ One ）
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Starting from this lesson, each lesson will teach a simple lesson in great detail C++ program , I'll take it as an example Visual
Studio2019（ Now the latest version ） take as an example （ Can not download Baidu ）. Now I am a junior one student , If there is something wrong, please point it out .
I believe that the first program of a general programmer is Hello World, So we also start with printing Hello World Let's go !
1. Open it first Visual Studio.
2. Open and choose to continue without code .
3. Open and select the file -> newly build -> project .
4. Next, choose C++ Empty project .
5. Enter project name （ It can be written here Hello World） And the location to save .
6. Next, in the Solution Explorer Right click the source file Select Add New item （ If there is no solution, please see the appendix 1）.
7. Then select C++ file , You can modify the file name yourself .
8. Write code .
The source code is as follows ：
#include<iostream> using namespace std; int main() { cout << "Hello World!";
return 0; }
Let's talk about the code
among ：
#include<iostream>
This is the introduction of a C++ A header file for input and output streams in , It's almost impossible C++ Required header file in .
using namespace std;
This is the reference standard's namespace , It's because it's used below cout.
You can use a code instead ：
#include<iostream> int main() { std::cout << "Hello World"; return 0; }
This needs to be added every time std::
int main（） { }
This is the main function , Every program must be written , Programs are executed from the main function .
cout<<"Hello Wrold";
This is printing Hello World.
You can also use the following code instead ：
#include<iostream> using namespace std; int main() { printf( "Hello World");
return 0; }
perhaps ：
#include<iostream> using namespace std; int main() { puts( "Hello World");
return 0; }
puts It's line wrapping , and cout and printf No word wrap .
Of course, there are many different ways to write it , I won't introduce it here .
last ： return 0;
This is the normal end of the program .
After explaining the program, start compiling and running !
9. You can click start （ No debugging ）
You can also click local Windows debugger ：
Finally, the running results ：
appendix 1：
There is no open view for Solution Explorer , Solution Explorer ：
This is my first post , After that, I will write the following courses slowly !
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