u Calculate e
Time Limit : 2000/1000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other)
Total Submission(s) : 2 Accepted Submission(s) : 2
Problem Description
A simple mathematical formula for e is

n e
- -----------
0 1
1 2
2 2.5
3 2.666666667
Time Limit : 2000/1000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other)
Total Submission(s) : 2 Accepted Submission(s) : 2
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 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.
n e
- -----------
0 1
1 2
2 2.5
3 2.666666667
4 2.708333333
这道题就是求e了,e的算法图中也给明了,假如i=4,e=1+1/1!+1/2!+1/3!+1/4!
就是注意一下格式,我是用printf,好控制一些
#include <stdio.h>
#include <math.h>
double arr[10];
void cal(void)
{
int i;
double ft,s;
ft=arr[0]=s=1.0;
for(i=1;i<10;++i)
{
s*=i;
arr[i]=1.0/double(s)+ft;
ft=arr[i];
}
}
int main()
{
int i;
printf("n e\n");
printf("- -----------\n");
cal();
printf("0 1\n");
printf("1 2\n");
printf("2 2.5\n");
for(i=3;i<10;++i)
printf("%d %.9f\n",i,arr[i]);
return 0;
}

该博客介绍了ACM竞赛中的一道简单题目,涉及计算e的值。通过公式1 + 1/1! + 1/2! + 1/3! + ...随着n趋近于无穷大,可以得到e的精确逼近。博客内容展示了使用0到9的n值计算e的结果,并提示在处理格式时,使用printf函数可以更好地控制输出。
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