problem 6.7 page 235, Introduction of java Programming 10th edition, 1)Write a m
ID: 3861776 • Letter: P
Question
problem 6.7 page 235, Introduction of java Programming 10th edition,
1)Write a method that computes future investment value at a given interest rate for a special number of years. The future investment is determined using the formula in Programming Exercise 2.21 Use the following method header:
public static double futureInvestmentValue(
double investmentAmount, double monthlyInterestRate, int years)
for example, futureInvestmentValue(10000, 0.05/12, 5) reutrns 12833.59
write a test program that prompts the user to enter the investment amount (e.g., 1000) and interest rate (e.g., 9%) and prints a table that displays future value for the years from 1 to 30 as shown below:
the amount invested: 1000 (enter0
Annual interest rate: 9 (enter)
1 1093.83
2 1196.41
...
29 13467.25
30 14730.57
problem 2) (convert milliseconds to hours, minutes, and seconds) Write a method that converts mill, to hours, minutes, and seconds using the following header:
public static String convertMillis(long millis)
the method returns a string as hours:minutes:seconds. for example, convertMillis(5500) returns a string 0:05, convert Millis(100000) returns a string 0:1:40, and convertMillis(555550000) returns a string 154:19:10.
problem 3)The area of a pentagon can be computed using the following formula: AREA = 5xs^2 / 4xtan(pie/5)
write a mthod that returns athe area of a pentagon using the following header:
public static double area(double side)
write a main method that prompts the user to enter the side of a pentagon and display its area. Here is a sample run:
Enter the side:5.5 (enter)
The area of the pentagon is 52.04444136781625
Explanation / Answer
Solution to problem 1)
import java.lang.*;
import java.util.Scanner;
public class futureInvest{
public static double futureInvestmentValue(double investmentAmount,
double monthlyInterestRate, int years) {
return investmentAmount * Math.pow(1.0 + monthlyInterestRate, 12 * years);
}
public static void main(String []args){
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the amount Invested");
double investmentAmount = scanner.nextDouble();
System.out.println("Enter Annual interest Rate");
double annualInterestRate = scanner.nextDouble();
for (int i = 1; i <= 30; i++) {
System.out.println(i + " "+ futureInvestmentValue(investmentAmount, annualInterestRate / 1200.0, i));
}
}
}
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