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今天才知道 printf("%.3f",result ); 本来就有四舍五入的功能，太弱了， 我竟然写出。。。。。。
int first = result * 10000;
if ( first % 10 < 5 )
first = first / 10;
else
first = first / 10 + 1;
int second = first % 1000;
cout << first / 1000 << '.' << second;
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