c++ - 为什么 C++ 这样做？

Question

没有为此显示任何错误，但出于某种原因，在我从 cin 输入整数后，窗口关闭并忽略我的回答，这应该确定它是否说“不，那不是我的最喜欢的号码”或继续功能。

这是我的代码:

#include <iostream>
using namespace std; 

void printSomething(int x); //Called Prototyping, means that you don't have to have the function on top.

int main() {

    cout << "Yo,\n";
    int a = 16;
    int b = 12;

    int y;

    if(a > b) {
        cout << "Opening Function.\n";
        cout << "\nWhat is my fav number, I forgot: ";
        cin >> y;
        if(y == 10) { //If my fav number is 10 then continue.
            printSomething(y); //Calls the function. (y) is the interger called at (int x)
        }
        else {
            cout << "No that isn't my fav number";
        }
    }
}

void printSomething(int x) { //This is the function. 
    cout << "\nHey! I am the function!\n#########" << endl;
    cout << "I iz lonely.";
    cin.get(); //Meant to keep the terminal open.
}

这是输出:

'Things.exe' (Win32): Loaded 'C:\Users\Matt\Documents\Visual Studio 2015\Projects\Things\Debug\Things.exe'. Symbols loaded.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\vcruntime140d.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp140d.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ucrtbased.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Cannot find or open the PDB file.
'Things.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Cannot find or open the PDB file.
The thread 0x2410 has exited with code -1073741510 (0xc000013a).
The thread 0x12a8 has exited with code -1073741510 (0xc000013a).
The thread 0x2b18 has exited with code -1073741510 (0xc000013a).
The thread 0x264c has exited with code -1073741749 (0xc000004b).
The program '[92] Things.exe' has exited with code -1073741510 (0xc000013a).

Answer 1

您陷入了使用 cin.get(); 暂停程序时经常出现的陷阱。当您使用它时，您需要确保输入缓冲区为空，这样代码实际上会阻塞，直到读入一个字符。

在流中留下输入的原因是 cin >> y; 在输入流中留下了换行符(按回车键)。为了确保输入流为空，您可以使用

std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n')

^{如果输入流中没有任何内容，这将暂停程序}

有关暂停程序的其他方法，请参阅:Preventing console window from closing on Visual Studio C/C++ Console application