[Dev-C++] why does this happen?

[feng yu <yu...@ya...>]

Hi,
 
I began using Dev C++ compiler a few days ago. Below is a problem I met.
 
I write a very simple program as the following:
 

#include <iostream>
using namespace std;
int main()
{
    int numberOfLanguages;
    cout<<"Hello reader.\n"
        <<"Welcome to C++.\n";
        
    cout<<"How many programing languages have you used?";
    cin>>numberOfLanguages;
    
    if (numberOfLanguages<1)
        cout<<"Read the preface. You may prefer\n"
                <<"a more elementary book by the same author.\n";
    
    else
        cout<<"Enjoy the book.\n";
    
    return 0;
}
 
There is no problem in compilation but when I execute the program, and input a number for "numberOfLanguages", the pop-up screen disappears. I mean all the interactive information I got when executing the program disappears unexpectedly. But there is no such problem when I use Microsoft Visual C++ 6.0. 
 
I appreciate your patient help.
 
A programming beginner



		
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