//bai2
import java.util.Scanner;

public class bai2 {
    public static void main(String[] args){
        int soNguyen;
        double soThuc;
        Scanner in = new Scanner(System.in);
        System.out.print("nhap so nguyen:");
        soNguyen = in.nextInt();
        System.out.print("nhap so thuc:");
        soThuc = in.nextDouble();
        System.out.println("so nguyen = "+soNguyen);
        System.out.println("so thuc = "+soThuc);
    }
}
//bai4
import java.util.Scanner;

public class bai4 {
    public static void main(String[] args){
        int soNguyen;
        double soThuc;
        Scanner in = new Scanner(System.in);
        System.out.print("Nhap so nguyen:");
        soNguyen = in.nextInt();
        System.out.print("Nhap so thuc:");
        soThuc = in.nextDouble();
        System.out.print("Nhap sau ky tu:");
        char sauKyTu = in.next().charAt(0);
        System.out.println("so nguyen:"+soNguyen);
        System.out.println("so thuc:"+soThuc);
        System.out.print("sau ky tu:"+ sauKyTu);

    }
}
//bai6
import java.util.Scanner;

public class bai6 {
    public static  void main(String[] args){
        int n1;
        int m1;
        double n2;
        double m2;
        Scanner in = new Scanner(System.in);
        System.out.print("Nhap n1=");
        n1 = in.nextInt();
        System.out.print("Nhap m1=");
        m1 = in.nextInt();
        System.out.print("Nhap n2=");
        n2 = in.nextDouble();
        System.out.print("Nhap m2=");
        m2 = in.nextDouble();
        int tongSoNguyen = n1+m1;
        double tongSoThuc = n2+m2;
        double tong = (double)(n1+n2);
        System.out.println("tong so nguyen="+tongSoNguyen);
        System.out.println("tong so thuc="+tongSoThuc);
        System.out.println("tong ="+tong);

    }
}
//bai8
import java.util.Scanner;

public class bai8 {
    public static  void main(String[] args){
        double so1;
        double so2;
        double so3;
        Scanner in =  new Scanner(System.in);
        System.out.print("so1=");
        so1 = in.nextDouble();
        System.out.print("so2=");
        so2 = in.nextDouble();
        System.out.print("so3=");
        so3 = in.nextDouble();
        double max = so1;
        if (so2 > max){
            max=so2;
        }
        if (so3>max){
            max=so3;
        }
        System.out.print("max="+max);
    }
}
//bai10
import java.util.Scanner;

import static java.lang.StrictMath.sqrt;

public class bai10 {
    public  static  void  main(String[] args){
        float a;
        float b;
        float c;
        Scanner in = new Scanner(System.in);
        a = in.nextFloat();
        b = in.nextFloat();
        c = in.nextFloat();
        System.out.println("phuong trinh bac 2:"+a+"x^2"+b+"x"+c+"=0");
        if(a==0){
            System.out.println("phuong trinh bac nhat: "+b+"x"+c);
            float nghiem = -c/b;
            System.out.println("nghiem="+nghiem);
        }else {
            float delta = b*b - 4*a*c;
            if(delta<0){
                System.out.println("vo nghiem");
            }else if(delta==0){
                float nghiemkep = -b/(2*a);
                System.out.println("nghiem="+nghiemkep);
            }else {
                float nghiem1 = (float) (-b + sqrt(delta))/(2*a);
                float nghiem2 = (float) (-b - sqrt(delta))/(2*a);
                System.out.println("nghiem1="+nghiem1);
                System.out.println("nghiem2="+nghiem2);

            }
        }
    }
}