I - u Calculate e
Description
A simple mathematical formula for e is
![](http://7xjob4.com1.z0.glb.clouddn.com/bcc4c5ac292d59aef31fcf3227405456)
where n is allowed to go to infinity. This can actually yield very accurate approximations of e using relatively small values of n.
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<iostream> #include<iomanip> using namespace std; double f(int n) { long double a=1; for(int i=1;i<=n;i++)a*=i; return a; } int main() { cout << "n e"<<endl<<"- -----------"<<endl; double e=1; cout<<0<<" "<<e<<endl; for(int i=1;i<=9;++i) { e+=1/f(i); cout<<i<<" "; if(i!=8) cout<<setprecision(10)<<e<<endl; else cout<<setprecision(10)<<e<<0<<endl; } //system("pause"); return 0; }
不难!!不要忘了long double !!!!