hdu 1012 u Calculate e

xiaoxiao2021-02-28  102

u Calculate e

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 45773    Accepted Submission(s): 21027 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 题目解析: 这个题的意思就是让你输出n从0到9公式求出的值,是一个非常简单的题,但是要注意输出。 代码: #include<iostream> #include<cstdio> using namespace std; int main() { int i,j,jiecheng[10]; double a[10]; cout<<"n e"<<endl<<"- -----------"<<endl; for(i=0; i<=9; i++) { for(j=0; j<i; j++) { jiecheng[0]=1; jiecheng[i]=i*jiecheng[i-1]; } a[0]=1; a[i]=a[i-1]+1.0/jiecheng[i]; if(i==0) cout<<"0"<<" "<<"1"<<endl; if(i==1) cout<<"1"<<" "<<"2"<<endl; if(i==2) cout<<"2"<<" "<<"2.5"<<endl; if(i>=3) { cout<<i<<" "; printf("%.9lf\n",a[i]); } } return 0; }
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