created compound calculator

practice_projects/src/compountInterest.java

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+import java.util.Scanner;
+
+public class compountInterest {
+
+    public static void main(String[] args) {
+
+        // Compound interest calculator
+
+        Scanner scanner = new Scanner(System.in);
+
+        // Initialize variables
+        double principal;
+        double rate;
+        int timesCompounded;
+        int years;
+        double amount;
+
+        // get inputs
+        System.out.print("Enter the principal amount: ");
+        principal = Double.valueOf(scanner.nextLine());
+
+        System.out.print("Enter the interest rate (in %): ");
+        rate = Double.valueOf(scanner.nextLine()) / 100;
+
+        System.out.print("Enter the # of times compounded per year: ");
+        timesCompounded = Integer.valueOf(scanner.nextLine());
+
+        System.out.print("Enter the # of years: ");
+        years = Integer.valueOf(scanner.nextLine());
+
+        // Calculate the compound interest
+        amount = principal * Math.pow(1 + rate / timesCompounded, timesCompounded * years);
+
+        // Print out the results
+        System.out.printf("\nThe amount after %d years is: $ %.2f", years, amount);
+
+
+
+        scanner.close();
+
+
+    }
+}

practice_projects/src/printF.java

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+public class printF {
+
+    public static void main(String[] args){
+        String name = "Spongebob";
+        char firstletter = 'S';
+        int age = 30;
+        double height = 60.5;
+        boolean isEmployed = true;
+
+        System.out.printf("Hello %s\n", name); // %s → formats a String
+
+        System.out.printf("Your name starts with a %c\n", firstletter); // %c → formats a single character (char)
+
+        System.out.printf("You are %d years old\n", age); // %d → formats an integer (decimal number)
+
+        System.out.printf("You are %f inches tall\n", height); // %f → formats a floating-point number (double / float)
+
+        System.out.printf("Employed: %b\n", isEmployed); // %b → formats a boolean (true / false)
+
+
+        // You can include multiple format specifiers in one print statement.
+        System.out.printf("%s is %d years old. He is %f inches tall\n", name, age, height);
+        // IMPORTANT: The values MUST be in the same order as the format specifiers.
+
+        double price = 9.99;
+        double price2 = -19.99;
+        double price3 = 19999.99;
+
+
+        // You can add special characters to alter how floats are shown
+        // a point '.' followed by a number specifies how many decimal places are shown
+        // A '+' shows a positive sign before the number
+        // // ( means that negative numbers are shown enclosed in ()
+        // 'space' means display a minus if negative, and a space if positive
+        // a ',' will add a comma grouping separator to the thousandths place
+        System.out.printf("The price for one is $% .2f, for two is $% .2f, and for 100 is $%,.2f\n", price, price2, price3);
+
+
+        // width
+
+        int id1 = 1;
+        int id2 = 23;
+        int id3 = 456;
+        int id4 = 7890;
+
+        // 0 = zero padding
+        // number = right justified padding
+        // negative number = left justified padding
+
+        System.out.printf("%4d\n", id1);
+        System.out.printf("%4d\n", id2);
+        System.out.printf("%4d\n", id3);
+        System.out.printf("%4d\n", id4);
+
+
+    }
+}