Question

SLUGGING PERCENTAGES & BATTING AVERAGES - SENTINEL LOOP

Develop a program in JAVA that will determine the slugging percentages and batting average of several New York Yankees from the 2006 season.  Slugging percentage is calculated by dividing the total number of bases by the number of at bats.  The number of bases would be one for every single, two for every double, three for every triple, and four for every home run.  The batting average is calculated by dividing the total number of hits by the number of at bats.  You do not know the number of players in advance, but for each player you know their number of singles, doubles, triples, home runs, total number of at bats, and the player's name (use the proper type and method for each variable).

You will use a while sentinel loop on the 1st item to input.  If it is not the sentinel, go into the while sentinel loop and separately input the rest of the input items (be careful of the enter in the input memory buffer for the player name).  You will then calculate the total bases and the slugging percentage.  You will then calculate the batting average.  You will then print out the player's name, the labeled slugging percentage for that player to three decimal places, and the labeled batting average for that player to three decimal places.  Use separate output statements.  Print a blank line between players.  This loop will repeat for as many players as you need.

Run your program with the following players and sentinel value (to show the sentinel value worked):

Singles:  158

Doubles:  39

Triples:  3

Home Runs:  14

At Bats:  623

Player:  Derek Jeter

Singles:  51

Doubles:  25

Triples:  0

Home Runs:  37

At Bats:  446             

Player:  Jason Giambi                                                                                                          

Singles:  104

Doubles:  26

Triples:  1

Home Runs:  35

At Bats:  572             

Player:  Alex Rodriguez                                                                  

Singles: -1

Answer 1

Solution: Things to remember:

• To take user input, use Scanner class
• To print output upto 3 decimal places, use String.format()
• I have used sentinel value (singles) to decide whether while loop will run or not. It terminates when (singles=-1)

import java.util.*;
import java.lang.*;
import java.io.*;

class Baseball
{
        public static void main (String[] args) throws java.lang.Exception
        {
                int singles=-1, doubles=0, triples=0, homerun=0, bats=0;
                String name="";
                
                Scanner in = new Scanner(System.in); 
                
        String input = in.nextLine();
        String[] s = input.split(":", 2);
        try { 
            singles = Integer.parseInt(s[1].trim());
        } 
        catch (NumberFormatException e) { 
        }
  
        while(singles != -1){
            input = in.nextLine();
            s = input.split(":", 2);
            try { 
                doubles = Integer.parseInt(s[1].trim());
            } 
            catch (NumberFormatException e) { 
            }
            
            input = in.nextLine();
            s = input.split(":", 2);
            try { 
                triples = Integer.parseInt(s[1].trim());
            } 
            catch (NumberFormatException e) { 
            }
            
            input = in.nextLine();
            s = input.split(":", 2);
            try { 
                homerun = Integer.parseInt(s[1].trim());
            } 
            catch (NumberFormatException e) { 
            }
            
            input = in.nextLine();
            s = input.split(":", 2);
            try { 
                bats = Integer.parseInt(s[1].trim());
            } 
            catch (NumberFormatException e) { 
            }
            
            input = in.nextLine();
            s = input.split(":", 2);
            name = s[1];
            
            int bases = 0, hits = 0;
            
            bases = 1*singles + 2*doubles + 3*triples + 4*homerun;
            hits = singles + doubles + triples + homerun;
            
            float slug = (float)bases/bats;
            float bat_avg = (float)hits/bats;
            
            System.out.println("Name : " + name); 
            System.out.println("Slugging percentage : " + String.format("%.3f", slug)); 
            System.out.println("Batting average : " + String.format("%.3f", bat_avg)); 
            System.out.println(); 
            
            
            input = in.nextLine();
            s = input.split(":", 2);
            try { 
                singles = Integer.parseInt(s[1].trim());
            } 
            catch (NumberFormatException e) { 
            }
        }
        }
}

Input format:

Singles: 158 Doubles: 39 Triples: 3 Home Runs: 14 At Bats: 623 Player: Derek Jeter Singles: 51 Doubles: 25 Triples: 0 Home Runs: 37 At Bats: 446    Player: Jason Giambi Singles: 104 Doubles: 26 Triples: 1 Home Runs: 35 At Bats: 572    Player: Alex Rodriguez Singles: -1

Output:

Name : Derek Jeter Slugging percentage : 0.483 Batting average : 0.343 Name : Jason Giambi    Slugging percentage : 0.558 Batting average : 0.253 Name : Alex Rodriguez Slugging percentage : 0.523 Batting average : 0.290

PS: Let me know if you face any issue to run the code or have any doubts.