20 lines
351 B
C++
20 lines
351 B
C++
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//http://acm.hdu.edu.cn/showproblem.php?pid=2011
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#include <cstdio>
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#include <cmath>
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int main(){
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int m,n;
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double sum;
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scanf("%d",&m);
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for(int i=0;i<m;i++){
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scanf("%d",&n);
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sum=0.0;
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for(int j=1;j<=n;j++){
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sum+=1.0/(double)j*pow(-1,j-1);
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}
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printf("%.2f\n",sum);
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}
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return 0;
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}
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