21 lines
520 B
C++
21 lines
520 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//读入输出优化的强迫症
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ios::sync_with_stdio(false);
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double sum = 0;
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for (int i = 0;; i++) {
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double term = 1.0 / (i * 2 + 1);
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if (i % 2 == 0)sum += term;
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else sum -= term;
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if (term < 1e-6) break; //注意科学记数法
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}
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printf("%.6f\n", sum); //保留六位小数
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//本程序耗时
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printf("Time used = %.2f\n", (double) clock() / CLOCKS_PER_SEC);
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return 0;
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} |