u Calculate e
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u Calculate e
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 35137 Accepted Submission(s): 15824
Problem Description
A simple mathematical formula for e is
where n is allowed to go to infinity. This can actually yield very accurate approximations of e using relatively small values of n.
Output
Output the approximations of e generated by the above formula for the values of n from 0 to 9. The beginning of your output should appear similar to that shown below.
Sample Output
n e
0 1
1 2
2 2.5
3 2.666666667
4 2.708333333
开始错了几次,后来在网上说第八个后面有个0,最后决定用printf控制格式
#include <iostream>#include <iomanip>#include <cstdio>using namespace std;double a;double sum[10];int main(){ a=1; sum[0]=1; sum[1]=2; for(int i=2; i<=9; i++) { a=a*(1.0/i); sum[i]=a+sum[i-1]; } cout<<"n e"<<endl; cout<<"- -----------"<<endl; cout<<"0 1"<<endl; cout<<"1 2"<<endl; cout<<"2 2.5"<<endl; for(int i=3;i<=9;i++) { printf("%d %.9f\n",i,sum[i]); } return 0;}
0 0
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