#include<iostream> #include<vector> #include<stdexcept> #include<stdio.h> using namespace std; void keep_window_open() { cin.clear(); //clear badbit flag

Question

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Asked: May 31, 20262026-05-31T15:28:49+00:00 2026-05-31T15:28:49+00:00

#include<iostream> #include<vector> #include<stdexcept> #include<stdio.h> using namespace std; void keep_window_open() { cin.clear(); //clear badbit flag

0

#include<iostream>
#include<vector>
#include<stdexcept>
#include<stdio.h>

using namespace std;

 void keep_window_open()
{   
    cin.clear();        //clear badbit flag
    cin.sync();        //clear stdin stream

    cout << "Please enter a character to exit\n";
    char ch;
    cin >> ch;
    cout <<ch <<endl;
    return;
}

int main()  
try{
    vector<int> v;
    int x;

    while(cin>>x) 
    {
        v.push_back(x);
    }   
    for(int i=0;i<=v.size();i++)
        cout<<"v["<<i<<"]=="<<v.at(i)<<endl;    //out of range

}catch (exception& oor) {
   cerr << "Out of Range error: " << oor.what() << endl;
    keep_window_open();
    return 1;   
}catch(...){         
    cerr<<"exception :something went wrong\n";
    return 2;
}

the code above is to practice the C++ exception handler function.

However, the program couldn’t run correctly at clearing stdin stream point under Ubuntu 11.04, but function well under Windows in Codeblocks . What’s wrong?

Besides, why “fflush(stdin);” couldn’t substitude “cin.clear(); cin.sync();”? And if there are other methods to clear streams?

thanks for your help!