package week_3; import static input.InputUtils. doubleInput ; /** Marathon You h
ID: 3749560 • Letter: P
Question
package week_3; import static input.InputUtils.doubleInput; /** Marathon You have a friend who wants to run a marathon race, which is 26.2 miles. Currently, your friend can run exactly 1 mile. Your friend's plan is to try to run 10% further every week, until they can run the entire marathon distance. So in the first week of training, they will run 1 mile; second week 1.1 miles, third week 1.21 miles... You would like to write a program to print out their training schedule. But, what if your friend thinks this schedule is too slow? Or too fast? Your friend can get to the marathon distance sooner by increasing their distance by 15% every week? Or, they may want to be more leisurely and increase by 3% every week. How does that affect the number of weeks needed? Then, you think, what if your friend decides they want to train for a 10 mile race? Or a 100 mile race? What if you friend starts with the ability to run 5 miles? Write a method that takes 3 arguments: - the current distance your friend can run, - the target distance - the percent increase. This should be expressed as 5 for 5%, 10 for 10%. In your method, use a loop to calculate the distance they need to run every week until they can run the target distance. The method should print the weekly distance data as a table. Use string formatting to display the weekly distances to 2 decimal places. The method should return the number of weeks it will take, as an integer. */ public class Question_2_Marathon { public static void main(String[] args) { new Question_2_Marathon().training(); } public void training() { double currentDistance = doubleInput("How far can you run right now, in miles? "); double targetDistance = doubleInput("What is the target distance, in miles? "); double weeklyPercentIncrease = doubleInput("What percent further do you want to run every week? Example: enter 5 for 5% or 10 for 10% "); // TODO Call your trainingSchedule method. } // TODO write a public method called trainingSchedule // It will take 3 double arguments: currentDistance, targetDistance, and percentIncrease // Ensure that you use three double arguments, in this order. // // The method will print a table of weeks and distances. // The final row should be a distance greater or equal to the target distance. // the table columns should be in that order (weeks then distance) // // Example table for start 1 miles, target 20, increase 10% // // Week Distance // 1 1.00 // 2 1.10 // 3 1.21 // 4 1.33 // // ..... more rows here ..... // // 31 17.45 // 32 19.19 // 33 21.11 // // // Note that the last line is the first distance greater than or equal to the target distance. // Use String formatting to display distances to 2 decimal places. Use String.format() or System.out.printf(). // // Finally, your method should return the total number of weeks in the training schedule }
Explanation / Answer
Java program:
package week_3;
import static input.InputUtils.doubleInput;
public class Question_2_Marathon {
public static void main(String[] args) {
new Question_2_Marathon().training();
}
public void training() {
double currentDistance = doubleInput("How far can you run right now, in miles? ");
double targetDistance = doubleInput("What is the target distance, in miles? ");
double weeklyPercentIncrease = doubleInput("What percent further do you want to run every week? Example: enter 5 for 5% or 10 for 10% ");
// TODO Call your trainingSchedule method.
int numOfWeeks= trainingSchedule(currentDistance, targetDistance, weeklyPercentIncrease);
System.out.println(" Total number of weeks in the training schedule:"+numOfWeeks);
}
//method implementation
public static int trainingSchedule(double cd,double td,double pi)
{
int i;
System.out.println("Weeek Distance");
//use a loop to calculate the distance they need to run every
for(i=1;cd<=td;i++)
{
System.out.printf("%d %.2f ",i,cd);
double pre=(cd/100)*pi;
cd=cd+pre;
}
System.out.printf("%d %.2f ",i,cd);
//returning total number of weeks in the training schedule
return (i);
}
}
package input;
import java.util.Scanner;
public class InputUtils
{
static Scanner scan = new Scanner(System.in);
public static double doubleInput(String string)
{
System.out.println(string);
double input=scan.nextDouble();
return input;
}
}
Output:
How far can you run right now, in miles?
1
What is the target distance, in miles?
20
What percent further do you want to run every week? Example: enter 5 for 5% or 10 for 10%
10
Weeek Distance
1 1.00
2 1.10
3 1.21
4 1.33
5 1.46
6 1.61
7 1.77
8 1.95
9 2.14
10 2.36
11 2.59
12 2.85
13 3.14
14 3.45
15 3.80
16 4.18
17 4.59
18 5.05
19 5.56
20 6.12
21 6.73
22 7.40
23 8.14
24 8.95
25 9.85
26 10.83
27 11.92
28 13.11
29 14.42
30 15.86
31 17.45
32 19.19
33 21.11
Total number of weeks in the training schedule:33
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