My program closes when I press enter . . .

rss14 (1)
I am a noob, so bare with me. 

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#include <iostream>
#include <string> 

#define pi 3.14 

using namespace std;

int main ()
{
    double C;
    int diameter; 
    cout << "Enter the diameter \n";
    
    cin >> diameter; 
    
    C = diameter * pi;
    
    cout << "The circumference is " << C; 
    

      return 0;
    
}


When I run the program, I see the first line, which says "Enter the diameter" After entering a number, and pushing enter, the program closes . . .

What's wrong here?
closed account (z05DSL3A)
See: Console Closing Down
http://www.cplusplus.com/forum/beginner/1988/
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