Scant_Method

#include<bits/stdc++.h>
using namespace std;

float func(float x){
    return (x*x)-(4*x)-10;
}

int main()
{
    float a,b;
    //cin>>a>>b;
    scanf("%f%f",&a,&b);

    Step:
    float f1=func(a);
    float f2=func(b);

    float r=((f2*a)-(f1*b))/(f2-f1);

    //cout<<a<<"   "<<b<<"   "<<"   "<<f1<<"   "<<f2<<"   ";
    printf("a: %.4f\tb: %.4f\tf1(a): %.4f\t\tf2(b):%.4f\t",a,b,f1,f2);

    if(abs((r-b)/r)>0.03){
        printf("Iterative is%.4f\n",r);
        a=b;
        f1=f2;
        b=r;
        f2=func(r);
        goto Step;
    }
    else  printf("Root is: %.4f\n",r);
    return 0;
}