Numerical-Methods-Calculator/Secant.cpp at master · limit07065/Numerical-Methods-Calculator · GitHub

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#include <iostream>
#include <iomanip>


using namespace std;

class Secant
{
	private:

		double a;
		double b;
		double c;
		double fa;
		double fb;
		double fc;
		double check;
		int dp;
		double error;
		string line;


		double setF( double x )
		{
		//		Enter f(x) here			//

		      return (x*x*x-6*x*x+11*x-6);

		//		Enter f(x) here			//
		}

		void setC()
		{
			c = (a*fb-b*fa)/(fb-fa);
			round(c);
			fc=setF(c);
			round(fc);
		}

		void round(double &x)
		{
			int temp; bool round=false; double y = 1;
			for(int i=0;i<=dp+1;i++)
			{
				x*=10;
			}
			temp = x;

			if(temp%10>=5)
				round = true;
			temp/=10;

			x = temp;
			for(int i=0;i<=dp;i++)
			{
				x/=10;
			}
			if(round)
				{
					for(int i=0;i<=dp;i++)
						y/=10;

					x+=y;
				}


		}


	public:

		Secant(double a,double b,int dp):a(a),b(b),check(1),line("__________________________________________________________________________"),dp(dp)
		{
			error = 0.5;
			for(int i=0;i<dp;i++)
			{
				error /=10;
			}
		}


		void print()
		{
			cout<<setw(12)<<fixed<<a<<" "<<setw(12)<<b<<" "<<setw(12)<<fa<<setw(12)<<fb<<" "<<setw(12)<<c<<" "<<setw(12)<<fc<<" "<<endl;
			cout<<line<<endl;
		}

		double process()
		{
			fa = setF(a);
			fb = setF(b);

			cout<<left<<setw(12)<<"a"<<setw(14)<<"b"<<setw(12)<<"f(a)"<<setw(13)<<"f(b)"<<setw(12)<<"c"<<setw(12)<<"f(c)"<<""<<endl;
			cout<<line<<endl;

			while(check>=error)
			{
				setC();
				print();

				if(fc>0)
					check = fc;
				else
					check = -fc;

				a = b;
				fa = fb;
				b = c;
				fb = fc;


			}

		}

};

int main()
{
	//Set a, b, and decimal places

	Secant test(3.8,4.5,1);

	//string line(10,'A');
	test.process();
	cin.get();
	cin.get();
	return 0;
}