D program code

[Vincent]

import std.stdio,std.cstream;

void main(string[] args)
{
        int first;
        int second;
        
        write ("First Number     : ");
        readf (" %s", &first);
        
        write ("Second Number    : ");
        readf (" %s", &second);
        
        int result = first + second;
                
        writeln("Result: ", result);
        din.getc();
}
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Problem: When I run this code why it is automatically exit when 
it shows the
         result. It allows me to input first numbers and second 
number but when
         it shows the result it will totally exit and I can't see 
the output.

I use D-IDE as my editor and dmd2 as my compiler.