HDOJ 1012 u Calculate e
2013-11-09 15:45
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来源:http://acm.hdu.edu.cn/showproblem.php?pid=1012
u Calculate e
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 25914 Accepted Submission(s): 11477
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
Source
Greater New York 2000
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题意:利用给出的公式计算e 的值。
题解:先把所有变量定义成double 型,对于n取0,1,2的情况就直接用cout输出,因为他们的小数位不一样,直接输出比较简单。后面的直接用公式计算便可,采用printf控制小数位输出。
PS:....
#include<iostream> using namespace std; int main() { double e=2.5,n,sum=1,i,j; cout<<"n e"<<endl; cout<<"- -----------"<<endl; cout<<"0"<<" "<<"1"<<endl; cout<<"1"<<" "<<"2"<<endl; cout<<"2"<<" "<<"2.5"<<endl; for(i=3;i<10;i++){ for( j=1;j<=i;j++){ sum*=j; } e+=1/sum; printf("%.0lf %.9lf\n",i,e); sum=1; } return 0; }
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