Chapter 4&5 Homework Answers


C H A P T E R  4
FUNDAMENTAL DATA TYPES
Home Work Answers



•• E4.4 Write a program that prompts the user for two integers and then prints
• The sum
• The difference
• The product
• The average
• The distance (absolute value of the difference)
• The maximum (the larger of the two)
• The minimum (the smaller of the two)
Hint: The max and min functions are declared in the Math class.

•• E4.5 Enhance the output of Exercise E4.4 so that the numbers are properly aligned:
Sum: 45
Difference: -5
Product: 500
Average: 22.50
Distance: 5
Maximum: 25
Minimum: 20 








••• E4.13 Write a program that reads a number between 1,000 and 999,999 from the user, wherethe user enters a comma in the input. Then print the number without a comma.Here is a sample dialog; the user input is in color:Please enter an integer between 1,000 and 999,999: 23,45623456Hint: Read the input as a string. Measure the length of the string. Suppose it containsn characters. Then extract substrings consisting of the first n – 4 characters and the last three characters.





Another solution:



















C H A P T E R  5
DECISIONS
Home Work Answers
•• E5.7 Write a program that reads in three integers and prints “in order” if they are sorted in
ascending or descending order, or “not in order” otherwise. For example,
1 2 5 in order
1 5 2 not in order
5 2 1 in order
1 2 2 in order



•• P5.6 Write a program that reads in the x- and y-coordinates of three corner points of a
triangle and prints out whether it has an obtuse angle, a right angle, or only acute
angles.







Code :

E4.5

import java.util.Scanner;
public class Print {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter First Number : ");
        double first = in.nextDouble();
        System.out.println("Please enter Secend Number : ");
        double secend = in.nextDouble();
        System.out.println("The sum: " + (first + secend));
        System.out.println("The difference: " + (first - secend));
        System.out.println("The product: " + (first * secend));
        System.out.println("The average: " + (first + secend) / 2);
        System.out.println("The distance: " + Math.abs(first - secend));
        System.out.println("The maximum: " + Math.max(first, secend));
        System.out.println("The minimum: " + Math.min(first, secend));
    }
}


E4.13

import java.util.Scanner;
public class Try {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter an integer between 1,000 and 999,999: ");
        String input = in.next();
        int length = input.length();
        String part1 = input.substring(0,length-4);
        String part2 = input.substring(length-3,length);
        String result = part1 + part2;
        System.out.println(result);
        }
    }

P4.13
public class Try {
    public final double a = 17.27;
    public final double b = 237.7;

    public void f(double T, double RH) {
        double f = ((a * T) / (b + T)) + Math.log(RH);
        double Td = (b * f) / (a - f);
        System.out.printf("The dew point temperature Td: %.4f°C.\n " , Td);
    }
}

Test :
public class TryTest {
    public static void main(String[] args) {
    Try ob = new Try();
    ob.f(120, 0.6); } }




E5.7
public class Try {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter Three Number : ");
        int first = in.nextInt();
        int secend = in.nextInt();
        int third = in.nextInt();
       
        if (first >= secend && secend >= third || first <= secend && secend <= third  )
            System.out.println(" in order");
        else
            System.out.println(" not in order");

    }
 }
P5.6
import java.util.Scanner;
public class Triangle {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("enter x1 y1 x2 y2 x3 y3 : ");
        double x1 = in.nextDouble();
        double y1 = in.nextDouble();
        double x2 = in.nextDouble();
        double y2 = in.nextDouble();
        double x3 = in.nextDouble();
        double y3 = in.nextDouble();
       
        double a = Math.sqrt(Math.pow((x1-x2),2)+Math.pow((y1-y2),2));
        double b = Math.sqrt(Math.pow((x2-x3),2)+Math.pow((y2-y3),2));
        double c = Math.sqrt(Math.pow((x1-x3),2)+Math.pow((y1-y3),2));

        if (    ( (a*a)==(b*b)+(c*c) )
             || ( (b*b)==(a*a)+(c*c) )
             || ( (c*c)==(a*a)+(b*b) )
            )
        {System.out.println("Right angle");}
        else if (    ( (a*a)>(b*b)+(c*c) )
                  || ( (b*b)>(a*a)+(b*b) )
                  || ( (c*c)>(a*a)+(b*b) )
                    )
        {System.out.println("Obtuse angle");}
        else
        {System.out.println("Acute angle");}
    }  }








End of Answers

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