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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. double f(double x){return 2*x*x*x+3*x-1;}
  4. int main(){
  5.     double a=0,b=1,mid,tol=1e-8;
  6.     while(fabs(b-a)>tol){
  7.         mid=(a+b)/2;
  8.         if(f(a)*f(mid)<0)b=mid;
  9.         else a=mid;
  10.     }
  11.     cout<<setprecision(10)<<fixed<<mid;
  12. }
  13.  
Success #stdin #stdout 0.01s 5324KB
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0.3129084036
https://ideone.com/INPoqa
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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