Harmonic Number
In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers:
In this problem, you are given n, you have to find Hn.
InputInput starts with an integer T (≤ 10000), denoting the number of test cases.
Each case starts with a line containing an integer n (1 ≤ n ≤ 108).
OutputFor each case, print the case number and the nth harmonic number. Errors less than 10-8 will be ignored.
Sample Input12
1
2
3
4
5
6
7
8
9
90000000
99999999
100000000
Sample OutputCase 1: 1
Case 2: 1.5
Case 3: 1.8333333333
Case 4: 2.0833333333
Case 5: 2.2833333333
Case 6: 2.450
Case 7: 2.5928571429
Case 8: 2.7178571429
Case 9: 2.8289682540
Case 10: 18.8925358988
Case 11: 18.9978964039
Case 12: 18.9978964139
思路:
问问神奇海螺怎么套公式
代码:
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