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救命啊

Posted by 19820913 at 2005-03-10 20:23:45 on Problem 1080
为什么我的程序老是出错的啊??
究竟什么问题的啊 
#include<iostream.h>
#include<fstream.h>
fstream out("out.dat",ios::out);
fstream in ("in.dat",ios::in);
int  main()
{
	int a,b;
    in>>a>>b;
	out<<a+b;
	return 0;
}

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