32 lines
403 B
C++
32 lines
403 B
C++
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#include <iostream>
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#include<cstdio>
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#include<algorithm>
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#include <cmath>
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using namespace std;
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//const int N=1e8+5;
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//void initialise(int n)
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//{
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//
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//}
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int main()
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{
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int t;
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double H,h,D;
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scanf("%d",&t);
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while(t--)
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{
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scanf("%lf%lf%lf",&H,&h,&D);
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// initialise(n);
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double add=D/2-(H-h);
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if(add>0)
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{
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printf("%.3lf\n",h+add);
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}
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else
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{
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printf("%.3lf\n",h);
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}
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}
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return 0;
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}
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