更新了许多

求出e的值.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdio>
+#include <ctime>
+#include <cmath>
+using namespace std;
+int main(){
+	int a;
+	double sum=1;
+	long long tem=1;
+	scanf("%d",&a);
+	for(int i=1;i<=a;i++){
+		for(int j=1;j<=i;j++){
+			tem*=j;
+		}
+		sum+=1*1.0/tem;
+		tem=1;
+	}
+	printf("%.10lf",sum);
+	return 0;
+}