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遇到浮点数 G++WA C++AC 在我这里已经成公理了... 一直不知道为什么...

Posted by bobobo at 2009-11-11 04:34:11 on Problem 3625
In Reply To:想说几点 Posted by:spracle_hao at 2009-05-26 14:19:43 
> 1. 我也是c++ AC，g++ WA，难道两者处理浮点数方面有讲究？？
> 
> 2. 关于坐标读入问题：用int完全可以，只不过计算距离时有：d=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),(x1-x2)(or(y1-y2))达10^6,平方后10^12,显然超出了int范围，正确的处理方法：d=sqrt(1.0(x1-x2)*(x1-x2)+1.0*(y1-y2)*(y1-y2))
> 
> 3.题目说了“without rounding”，也就是说不存在四舍五入，那为什么反而("%.2f",ans)AC,而("%.2f",((int)(ans*100))/100.0)WA呢？
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