Quadratic-equation/Quadeq.java at master · pontuf/Quadratic-equation · GitHub

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import javax.swing.*;
import java.io.*;
import java.util.*;

public class Quadeq{
    static String s[]=new String[2];
    static int count;
    public static String alg(int num, BufferedReader br,String ur[]) throws Exception{
        Random rand=new Random(num);
        double a=0,b,c,D,x1=0,x2=0;
        System.out.println("###Equation "+num+"###");
        System.out.println("Enter first coefficient");
        while (a==0) a=rand.nextInt(11);
        System.out.println("Enter second coefficient");
        b=rand.nextInt(11);
        System.out.println("Enter third coefficient");
        c=rand.nextInt(11);
        s[0]="";
        s[0]=Double.toString(a)+"x²";
        if (b>=0) s[0]=s[0]+"+";
        s[0]=s[0]+Double.toString(b)+"x";
        if (c>=0) s[0]=s[0]+"+";
        s[0]=s[0]+Double.toString(c)+"=0";
        System.out.println(s[0]);
        D=(b*b)-(4*a*c);
        if(D>=0){
            x1=(-b+Math.sqrt(D))/(2*a);
            x2=(-b-Math.sqrt(D))/(2*a);
            s[1]=String.format("%.2g%n",x1)+"; "+String.format("%.2g%n",x2);
        }
        if (D==0) s[1]=String.format("%.2g%n",x1);
        if(D<0) {
            D=(Math.sqrt(-D))/(2*a);
            x1=(-b)/(2*a);
            s[1]=String.format("%.2g%n",x1)+"+j"+String.format("%.2g%n",D)+
            "; "+String.format("%.2g%n",x1)+"-j"+String.format("%.2g%n",D);
        }
        System.out.println("######");
        ur[num]=s[0];
        return s[1];
    }
    public static void main(String args[]) throws Exception{
        //BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter the count of equations");
        s[0]=br.readLine();
        count=Integer.parseInt(s[0]);
        String res[]=new String[count+1];
        String ura[]=new String[count+1];
        for(int i=0;i<=count;i++){
            res[i]="0";
            ura[i]="0";
        }
        String ur[]=new String[count+1];
        for(int i=1;i<=count;i++){
            res[i] = alg(i,br,ur);
        }
        JFrame jf=new JFrame("Solution of quadratic equation");
        jf.setSize(jf.getMaximumSize());//(1280,768);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTable jt=new JTable(count+1,2);
        jt.setVisible(true);
        jt.setBounds(1,1,600,16*(count+1));
        jt.setValueAt("Equation",0,0);
        jt.setValueAt("Solution",0,1);
        for(int i=1;i<=count;i++){
            jt.setValueAt(ur[i],i,0);
            jt.setValueAt(res[i],i,1);
        }
        jt.setTableHeader(null);
        JScrollPane jsp=new JScrollPane(jt,
        JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
        JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        jf.add(jsp);
        jf.setSize(jt.getPreferredScrollableViewportSize());
        jf.setVisible(true);
    }
}