C++ beginner, execution window disappears quickly

问题

I am a beginner in C++ and I was trying to write a program that finds the average of two numbers, but when I run the program, the window disappears without allowing me to see the result. Can someone please help me? Thanks

 #include <iostream>
 using  namespace std;
 int main()
 {
 int number1,number2,answer;
 cout << "number1? ";
 cin >> number1;
 cout << "number2? ";
 cin >> number2;

 answer = (number1 + number2)/2;

 cout << answer<<endl;
 return 0;
 }

回答1:

Solution #0 (proper):
Run program from shell (cmd.exe, bash)

Solution #1 (proper):
Run program from orthodox file manager. Far Manager or midnight commander.

Solution #2 (alternative);
Redirect output to file. program.exe >file.txt from command line.

Solution #3 (improper):
Launch message box, use "sleep"/"Sleep" to delay program termination.

Solution #4 (improper):
Request user input at the end of program.

Solution #5 (improper):
Set breakpoint on "return 0", debug the program.

Solution #6 (windows+msvc):
Launch program from msvc by Ctrl+F5 using debug build. You'll get "press key to continue" prompt.

回答2:

Put a breakpoint at your return statement. It won't stop on an uncaught exception but that can be fixed with a try/catch block at the outermost part of main.

回答3:

Before you return add system("PAUSE"); and this should fix your problem.

回答4:

If you are using Visual Studio, hit CTRL+F5 to run. That inserts a "Hit RETURN to continue" for a console application.

回答5:

Include this header:

#include <stdio.h>

And add a call to getchar() before you return:

cout << answer<<endl;

getchar(); // wait for user input

return 0;

回答6:

Solution #6 from SigTerm (above) is not guaranteed to work. In Visual Studio you should right-click your project and choose:

Properties | Configuration Properties | Linker | System | SubSystem

and in the dropdown choose Console (/SUBSYSTEM:CONSOLE).

回答7:

I always hated that...I always find the easiest to be system("pause"); right before you return, but that's not a portable solution (cin.get is though). There are many other ways as well, some of which are mentioned in the link below.

http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvc/thread/1555ce45-8313-4669-a31e-b95b5d28c787

Edit: system("pause"); is terrible, should never be used, and may or may not end life on this planet as we know it, even if by a beginner in a project called 'Hello'. Using system("pause") is expensive and dangerous, and if you use it, you'll never see anyone you love again. Don't do it. Use cin.get or something else.

来源：https://stackoverflow.com/questions/9436108/c-beginner-execution-window-disappears-quickly

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