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In Introduction To Java Programming

Exercise 3.3 – Algebra: Solve 2×2 Linear Equations

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The program below is the solution to Liang’s Introduction to Java (9th Edition) Chapter 3 Exercise 3.3.

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> */<br />import java.util.Scanner;<br /><br />public class Ex03_03 {<br />    public static void main(String[] args) {<br />        // declare variables<br />        double a, b, c, d, e, f, num1, num2, denom, x, y;<br />        <br />        // create Scanner to read user input<br />        Scanner input = new Scanner(System.in);<br /><br />        System.out.print("This program solves 2x3 system of linear equations. "<br />                + "nnFor example in the following equation 9x + 4y = -6 "<br />                + "n                                      3x - 5y = -21"<br />                + "na, b, c, d, e, f = 9, 4, 3, -5, -6, -21 respectively. "<br />                + "nEnter each number separated by pressing space or enter.");<br />        <br />        // prompt user to enter details<br />        System.out.print("nnEnter a, b, c, d, e, f: ");<br />        a = input.nextDouble();<br />        b = input.nextDouble();<br />        c = input.nextDouble();<br />        d = input.nextDouble();<br />        e = input.nextDouble();<br />        f = input.nextDouble();<br />        <br />        //calculate x and y<br />        num1 = ((e * d) - (b * f));<br />        num2 = ((a * f) - (e * c));<br />        denom = ((a * d) - (b * c));<br />        <br />        x = num1 / denom;<br />        y = num2 / denom;<br />        <br />        if (denom == 0) {<br />            System.out.println("nThe equation has no solution.");<br />        } else {<br />            System.out.println("x is " + x + " and y is " + y);<br />        }<br />    }<br />}<br />

Program sample runClick here…

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In Introduction To Java Programming

Exercise 3.1 – Algebra: Solve Quadratic Equations

1 Min Read

The program below is the answer to Liang’s Introduction to Java Programming (9th Edition) Chapter 3 Exercise 3.1.

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> * Exercise 3.1 - Algebra: Solve Quadratic Equations<br /> */<br />import java.util.Scanner;<br /><br />public class CheckerboardPatternOfAsterisks {<br />    public static void main (String [] args) {<br />        <br />        // declare variables<br />        double a, b, c, disc, r1, r2;<br />        <br />        // create Scanner to read user input<br />        Scanner input = new Scanner(System.in);<br /><br />        // prompt user to enter details<br />        System.out.print("Enter a, b, c: ");<br />        a = input.nextDouble();<br />        b = input.nextDouble();<br />        c = input.nextDouble();<br /><br />        //calculate the discriminant<br />        disc = b * b - (4 * a * c);<br />        <br />        //calculate the roots<br />        r1 = (-b + Math.pow(disc, 0.5)) / (2 * a);<br />        r2 = (-b - Math.pow(disc, 0.5)) / (2 * a);<br /><br />        // display the results<br />        if (disc &gt; 0){<br />                System.out.println("The roots are " + r1 + " and " + r2 + "n");<br />        }<br />        <br />        if (disc == 0){<br />                System.out.println("The root is " + r1 + "n");<br />        }<br />        <br />        if (disc &lt; 0){<br />                System.out.println("The equation has no real roots.n");<br />        }<br />    }<br />}<br />

Sample Program runClick…

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In Introduction To Java Programming

Exercise 2.21 – Financial Application: Calculate Future Investment Value

1 Min Read

The program below is the solution to Liang’s Introduction to Java Programming (9th Edition) Chapter 2 Exercise 2.21.

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> *<br /> * Exercise 2.21 - Financial application: calculate future investment value<br /> *<br /> */ <br /><br />import java.util.Scanner;<br /><br />public class Ex02_21 {<br /><br />    public static void main(String[] args) {<br />        <br />        // Display Program Information<br />        System.out.println("This Program Calculates The Future Investment Value"<br />                + " of Investment.n");<br /><br />        // create Scanner <br />        Scanner input = new Scanner(System.in);<br /><br />        // prompt user to enter details<br />        System.out.println("Enter investment amount:");<br />        double investmentAmount = input.nextDouble();<br />        System.out.println("Enter annual interest rate in percentage:");<br />        double monthlyInterestRate = input.nextDouble();<br />        System.out.println("Enter number of years:");<br />        double numberOfYears = input.nextDouble();<br /><br />        // calculate s using the formula futureInvestmentValue = <br />        // investmentAmount x (1 + monthlyInterestRate)^numberOfYears*12<br />        double futureInvestmentValue =<br />                investmentAmount * Math.pow((1 + (monthlyInterestRate / 1200)), (numberOfYears * 12));<br />        // format futureInvestmentValue to two decimal places<br />        futureInvestmentValue = (int) (futureInvestmentValue * 100) / 100.0;<br /><br />        // display the result<br />        System.out.println("Accumulated value is $" + futureInvestmentValue + "n");<br />    }<br />}<br />

Program outputClick here…

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In Introduction To Java Programming

Java Program to Print Table

1 Min Read

The program below is the answer to Liang’s Introduction to Java Programming (9th Edition) Chapter 2 Exercise 2.18.

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> *<br /> * Exercise 2.18 - Print a table<br /> *<br /> */ <br /><br />public class Ex02_18 {<br /><br />    public static void main(String[] args) {<br />        <br />        // Display Program Information<br />        System.out.println("This Program Prints A Table.n");<br />        System.out.println("tatbtpow(a, b)");<br />        System.out.println("t" + 1 + "t" + 2 + "t" + (int) Math.pow(1, 2));<br />        System.out.println("t" + 2 + "t" + 3 + "t" + (int) Math.pow(2, 3));<br />        System.out.println("t" + 3 + "t" + 4 + "t" + (int) Math.pow(3, 4));<br />        System.out.println("t" + 4 + "t" + 5 + "t" + (int) Math.pow(4, 5));<br />        System.out.println("t" + 5 + "t" + 6 + "t" + (int) Math.pow(5, 6));<br />    }<br />}<br />

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