Assignment A5

Heron’s Formula §

import java.text.DecimalFormat;  
import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // Heron's Formula        
        int timesUsed = 0;  
        Scanner input = new Scanner(System.in);  
        while (timesUsed < 3) {  
            System.out.println("Enter the length of side A: ");  
            double a = input.nextDouble();  
            System.out.println("Enter the length of side B: ");  
            double b = input.nextDouble();  
            System.out.println("Enter the length of side C: ");  
            double c = input.nextDouble();  
            DecimalFormat df = new DecimalFormat("#,###.###");  
            System.out.println("The area of the triangle is: " + df.format(huronFormula(a, b, c)) + " units squared");  
  
            timesUsed++;  
        }  
    }  
  
    public static double huronFormula(double a, double b, double c) {  
        double s = (a + b + c) / 2;  
        return Math.sqrt(s * (s - a) * (s - b) * (s - c));  
    }  
}

GCF Calculator §

import java.text.DecimalFormat;  
import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // greatest common factor calculator        
        Scanner input = new Scanner(System.in);  
        int timesUsed = 0;  
        while (timesUsed < 3) {  
            System.out.println("Enter two numbers to find the greatest common factor of.");  
            int a = input.nextInt();  
            int b = input.nextInt();  
            System.out.println("The greatest common factor of " + a + " and " + b + " is " + GCF(a, b));  
            timesUsed++;  
        }  
    }  
  
    public static int GCF(int a, int b) {  
        int gcf = 1;  
        // math stuff  
        for (int i = 1; i <= a && i <= b; i++) {  
            // loop runs while the iterator is less than or equal to both numbers  
            if (a % i == 0 && b % i == 0) {  
                // if both numbers are divisible by the iterator, set the gcf to the iterator  
                gcf = i;  
            }  
        }  
        return gcf;  
    }  
}

Fraction Simplifier Challenge §

import java.text.DecimalFormat;  
import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // fraction simplifier        
        Scanner input = new Scanner(System.in);  
        int timesUsed = 0;  
        while (timesUsed < 3) {  
            System.out.println("Enter a fraction to simplify (e.g 2/4): ");  
            String fraction = input.nextLine();  
            String[] fractionParts = fraction.split("/");  
            int numerator = Integer.parseInt(fractionParts[0]);  
            int denominator = Integer.parseInt(fractionParts[1]);  
            System.out.println(simplify(numerator, denominator));  
            timesUsed++;  
        }  
    }  
  
    public static int gcd(int a, int b) {  
        if (b == 0) return a;  
        return gcd(b, a%b);  
    }  
  
    public static String simplify(int numerator, int denominator) {  
        int gcd = gcd(numerator, denominator);  
        numerator /= gcd;  
        denominator /= gcd;  
        // if the fraction is an improper fraction, convert to mixed number  
        if (numerator > denominator) {  
            int whole = numerator / denominator;  
            numerator %= denominator;  
            return whole + " " + numerator + "/" + denominator;  
        }  
        return numerator + "/" + denominator;  
    }  
}