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21 lines
452 B
21 lines
452 B
#include <stdio.h>
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int main() {
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int n = 0;
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scanf("%d", &n);
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double numerator = 2.0, //和分母
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denominator = 1.0; //分子
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double oldNumerator = 0.0;
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double result = 0.0;
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for (int i = 0; i < n; ++i) {
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result += numerator / denominator;
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oldNumerator = numerator;
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numerator += denominator;
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denominator = oldNumerator;
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}
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printf("%.6f", result);
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} |