使用cmd运行C ++程序

Question

When I run a program through command line, once the program ends, cmd instantly closes, so I can't see the output easily. Is there anyway to stop this from happening so I can actually verify the output?

#include<iostream>
using namespace std;
class Exercises {
public: 
    void sayHello(int x) {
        for (int i = 0; i < x; i++)
            cout << "Hello!!" << endl;
    }
}exercise;

int main() {
    exercise.sayHello(4);
    return 0;
}

Answer 1

You can also use cin.get();

It will wait for you to press enter or until you close the program.

Answer 2

Following methods can help in keeping the command window till another input is provided.

#include <conio.h>
void main(){

// your program here

 getch();
}

Another way is to use system("pause"); at the end of your program.

Answer 3

You can pause the execution of the program for a certain amount of time with:

sleep(5); // sleep for 5 seconds

You could place that at the end of the program before return 0; .

Answer 4

If you don't mind waiting for a keypress at the end of your program, you could put something in.

The simplest way in Windows is to do:

system("pause");

Don't do this if you are releasing your software though. You can implement the behaviour of the pause command easily enough.

std::cout << "Press any key to continue . . . " << std::flush;
while( !_kbhit() ) Sleep(25);
getch();

That's using stuff from conio.h .

However, I'm concerned about the cmd shell itself closing. When you say you "run with cmd", are you actually running up a shell, then typing in your program name and hitting Enter? If that closes the shell, then something is wrong. More likely, you're running it by double-clicking the file in Explorer, right?