'commit'

RuMenJingDian/Others/L_2_3.cpp

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