# C++ Program for Secant Method to find the roots of an Equation

```//Secant Method for finding the roots of an equation
#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
double f(double x);    //declare the function for the given equation
double f(double x)    //define the function here, ie give the equation
{
double a=pow(x,3)-x-11.0;    //write the equation whose roots are to be determined
return a;
}
int main()
{
cout.precision(4);
cout.setf(ios::fixed);        //set the precision of the output
double a,b,c,e;
cout<<"Enter the initial guess\na=";
cin>>b;
cout<<"b=\n";                //take an intial guess
cin>>c;
cout<<"Enter the degree of accuracy\n";
cin>>e;                    //take the desired accuracy
do
{
a=b;
b=c;                //make b equal to the last calculated value of c
c=b-(b-a)/(f(b)-f(a))*f(b);    //calculate c
if (f(c)==0)
{
cout<<"\nThe root of the equation is "<<c;    //print the root
return 0;
}
}while(abs(c-b)>=e);            //check if the error is greater than the desired accuracy
cout<<"\nThe root of the equation is "<<c;    //print the root
return 0;
}

``` Explanation of the code: [wpedon id="7041" align="center"]

## 4 thoughts on “C++ Program for Secant Method to find the roots of an Equation”

1. how can i get PDF including some of this numerical problem with solution??

2. the code given is differebt from the one used in the video