Hdu 1012 u Calculate e
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2022-07-15 08:53:23
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u Calculate e
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 46276 Accepted Submission(s): 21237
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
#include<stdio.h>int jc(int n)
{
int i,j=1;
for(i=1;i<=n;i++)
j=j*i;
return j;
}
int main()
{
int n,i;
double e=2.5;
printf("n e\n");
printf("- -----------\n");
printf("0 1\n");
printf("1 2\n");
printf("2 2.5\n");
for(i=3;i<=9;i++)//为什么从3开始,是因为从3之后,小数点后有9位小数 {
e=e+1.0/jc(i);
printf("%d %.9lf\n",i,e);
}
return 0;
}