Computer Science Programming Tutorials
In Introduction To Java Programming

Exercise 3.3 – Algebra: Solve 2×2 Linear Equations

1 Min Read

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 Pascal

Pascal Program Using Hero’s Formular To Calculate Area Of A Triangle

1 Min Read

Just came across a program I wrote then in school to calculate area of triangle using Hero’s formula.Program flowchart

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> *<br /> */ <br /><br />Program AreaOfTriangle;<br />const<br />PI = 3.142;<br />type<br />r=array [1..3] of real; {hold the values of sides of triangle}<br />var<br />d:r;<br />A:real;<br />K:integer;<br />s:real;<br />begin<br />   For k:= 1 to 10 Do  {loop for the 10 sets of values}<br />     begin<br />        writeln ('Enter Values of first side');<br />        read (d[1]);<br />        writeln ('Enter Values of second side');<br />        read (d[2]);<br />        writeln ('Enter Values of third side');<br />        read (d[3]);<br />        s:= (d[1]+d[2]+d[3])/2;  {compute s}<br />           A:= Sqrt(s*((s-d[1])*(s-d[2])*(s-d[3]))); {compute area}<br />        writeln ('Area = ', A);<br />     end<br />end.       <br />

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