Question

Objective:

Create a program that uses the methods in the String and Math classes to do the following:

• Ask the user to enter two nouns
• Tell the user how many letters the nouns are from eachother in the dictionary.
• Tell the user the last letter of each of the nouns
• Tell the user the position of the letter "e" in each of the nouns, -1 if no "e" exists in the word. For full credit, you must use quotations around e in the outprint display as shown below.

• Ask the user to enter three integers for the values of A, B, and C in a quadratic equation.

• Calculate and print the roots of the corresponding quadratic equation. You should remember the quadratic formula from a math class, if not, look it up!
• Note: if no roots exist, Nan (Not a number) will display.

Answer 1

import java.io.*;
class Program
{
    public static void main(String[]args)throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String str1, str2;
        char ch;
        int l1, l2, letters, i, flag1=0, flag2=0, a, b, c;
        double d, r1, r2;
        System.out.println("Enter first noun");
        str1=br.readLine();
        System.out.println("Enter second noun");
        str2=br.readLine();
        l1=str1.length();// length of first noun
        l2=str2.length();// length of second noun
        letters=str1.compareToIgnoreCase(str2);// comparing the two nouns lexicographically
        System.out.println("The diference between the position of two nouns in dictionary is "+letters);
        System.out.println("Last letter of "+str1+" is "+str1.charAt(l1-1));// printing last letter of first noun
        System.out.println("Last letter of "+str2+" is "+str2.charAt(l2-1));// printing last letter of second noun
        for(i=0; i<l1; i++)
        {
            ch=str1.charAt(i);
            if(ch=='e'||ch=='E')
            {
                System.out.println("The position of letter "+ "e" +" in "+str1+" is "+(i+1));//printing position of "e" in first noun
                flag1=1;
                break;
            }
        }
        for(i=0; i<l2; i++)
        {
            ch=str2.charAt(i);
            if(ch=='e'||ch=='E')
            {
                System.out.println("The position of letter "+"e"+" in"+str2+" is "+(i+1));//printing position of "e" in second noun
                flag2=1;
                break;
            }
        }
        if(flag1==0)
            System.out.println("The position of letter "+"e"+" in "+str1+" is -1");
        if(flag2==0)
            System.out.println("The position of letter "+"e"+" in "+str2+" is -1");
        System.out.println("Enter three integer for values of a, b and c in a quadratic equation");
        a=Integer.parseInt(br.readLine());
        b=Integer.parseInt(br.readLine());
        c=Integer.parseInt(br.readLine());
        d=(b*b)-4*a*c;// calculating discriminant
        System.out.println("Roots of the quadratic equation  ("+a+")x^2+("+b+")x+("+c+") are:");
        if(d<0) //if discriminant less than zero roots don't exist
            System.out.println("NAN(Not a number");
        else
        { //if discriminat greater than zero roots exist
            r1=((-b)+Math.sqrt(d))/(2*1); // using Math.sqrt function
            r2=((-b)-Math.sqrt(d))/(2*1); // using Math.sqrt function
            System.out.println(r1+" and "+r2);
        }

    }
}