28 lines
672 B
C++
28 lines
672 B
C++
#include <stdio.h>
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#include <stdlib.h>
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#include<math.h>
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int main()
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{
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int t;
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int a,b,c,d,max,count=0;
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double p,ans;
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scanf("%d",&t);
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while(t--)
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{
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scanf("%d%d%d%d",&a,&b,&c,&d);
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if(a>b) max=a;
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else max=b;
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if(max<b) max=b;
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if(max<c) max=c;
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if(max<d) max=d;
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if(max-(a+b+c+d-max)>=0)
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{
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printf("Case %d: -1\n",++count);
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continue;
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}
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p=(a+b+c+d)*1.0/2;
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ans=sqrt((p-a)*(p-b)*(p-c)*(p-d));
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printf("Case %d: %.6lf\n",++count,ans);
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}
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}
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