Question

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  1. Write a Python program
  2. Test, debug, and execute the Python program
  3. Save your program in a .py file and submit your commented source code online.

1. (25 pts.) Implement the following psuedocode WITHOUT using any global variables (i.e. you must use call by reference) or return values from any of your functions. You will be graded according to proper usage of call by reference and call by value. In other words, if an argument value is to be returned by the function, you must use call by reference, and if an argument need not be returned by the function, you must use call by value.
   

   MAIN
      CALL NUM_PLAYERS
      FOR 1 TO NUM_PLAYERS
        CALL INPUT
        CALL COMPUTE
      END FOR
      CALL OUTPUT
   END MAIN
   
   FUNCTION NUM_PLAYERS
      READ number     ->  You must unsure that number entered is >= 0
   END NUM_PLAYERS
   
   FUNCTION INPUT     ->  You must unsure that all numbers entered are >= 0
      READ at_bats, singles, doubles, triples, homers   
   END INPUT
   
   FUNCTION COMPUTE
      batting_ave  = (singles + doubles + triples + homers)/at_bats
      slugging_pct = (singles + doubles*2 + triples*3 + homers*4)/at_bats
      team_at_bats = team_at_bats + at_bats
      team_hits    = team_hits + singles + doubles + triples + homers
      PRINT "Player #", x, batting_ave, slugging_pct
   END COMPUTE
   
   FUNCTION OUTPUT
        PRINT team_batting average
   END OUTPUT
   
   

2. (25 pts.) Design a program that adheres to the following guidelines:
   
   • The program contains a Student class that maintains the following information:
     
   • Name (string)
   • StudentID (string)
   • GpaHours (number)
   • QualityPoints (number)
   • In addition, all instance variables should be private to the class and the program should contain the following:
   • a __init__ constructor method that allows you to create a Student object with values provided for Name, StudentID, GpaHours and QualityPoints. In addition, the constructor should provide for default values of 0 for GpaHours and QualityPoints.
     
   • a __str__ method that allows you to print the values of a Student object
     
   • An accessor method that returns the value of GpaHours and an accessor method that returns the value of QualityPoints.
     
   • A mutator method that directly modifies GpaHours with a provided value and a mutatormethod that directly modifies QualityPoints with a provided value
     
   • A mutator method that allows you to add valid values to the GpaHours and QualityPoints. This method should provide error checking to ensure that the QualityPoints is not more than 4 times greater than the value provided for GpaHours.
     
   • A method called CalculateGpa that determines a students GPA (GPA = GpaHours / QualityPoints). This method should provide error checking to ensure that divide by zero does not occur.

Answer 1

Screenshot

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Program

#Method to read number of players in the team
#Check the user input must be positive integer
#It take lst as reference arument
#Append value into list
def NUM_PLAYERS(lst):
    n=int(input("Enter number of players: "))
    while(n<1):
        print("Number of players must be postive Re=enter")
        n=int(input("Enter number of players: "))
    lst.append(n)
#Method to input players details
#Which prompt for batting,singles,doubles,tiple and homers counts
#Error check the inputs are positive
#Take player number and list a
#Append each values into list
#Which act as reference parameter
def INPUT(playerLst,playerNum):
    print("Enter player",playerNum," details")
    at_bats=int(input("Enter number of batted: "))
    while(at_bats<1):
         print("Batted count must be postive Re=enter")
         at_bats=int(input("Enter number of batted: "))
    playerLst.append(at_bats)
    singles=int(input("Enter number of singles: "))
    while(singles<1):
         print("Singles count must be postive Re=enter")
         singles=int(input("Enter number of singles: "))
    playerLst.append(singles)
    doubles=int(input("Enter number of doubles: "))
    while(doubles<1):
         print("Doubles count must be postive Re=enter")
         doubles=int(input("Enter number of doubles: "))
    playerLst.append(doubles)
    triples=int(input("Enter number of triples: "))
    while(triples<1):
         print("Tripless count must be postive Re=enter")
         doubles=int(input("Enter number of triples: "))
    playerLst.append(triples)
    homers=int(input("Enter number of homers: "))
    while(homers<1):
         print("Homers count must be postive Re=enter")
         doubles=int(input("Enter number of homers: "))
    playerLst.append(homers)
#Method to compute each player averages and team average
#Display Player average
#Take two list and player number as input parameter
#Calculated team toal and team hit total and append into list
#Which act as reference variable             
def COMPUTE(playerLst,lst,playerNum):
   batting_ave = (playerLst[1] + playerLst[2] +playerLst[3] + playerLst[4])/playerLst[0]
   slugging_pct = (playerLst[1] + playerLst[2]*2 +playerLst[3]*3 + playerLst[4]*4)/playerLst[0]
   lst[0] = lst[0] + playerLst[0]
   lst[1]    = lst[1] + playerLst[1] + playerLst[2] +playerLst[3] + playerLst[4]
   print("Player ",playerNum," batting average:%.2f"%batting_ave," slugging pct:%.2f"%slugging_pct)
#Method to print team batting average
def OUTPUT(lst):
    print("Team batting average: %.2f"%(lst[1]/lst[0]))
#Main method
#Call each above functions
def main():
    lst=[]
    NUM_PLAYERS(lst)
    numPlayers=lst[0]
    lst=[]
    lst.append(0)
    lst.append(0)
    for i in range(1,numPlayers+1):
        playerLst=[]
        INPUT(playerLst,i)
        COMPUTE(playerLst,lst,i)
    OUTPUT(lst)

#Program start
main()

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Output

Enter number of players: 2
Enter player 1 details
Enter number of batted: 10
Enter number of singles: 4
Enter number of doubles: 8
Enter number of triples: 6
Enter number of homers: 7
Player 1 batting average:2.50 slugging pct:6.60
Enter player 2 details
Enter number of batted: 12
Enter number of singles: 8
Enter number of doubles: 9
Enter number of triples: 7
Enter number of homers: 8
Player 2 batting average:2.67 slugging pct:6.58
Team batting average: 2.59
Press any key to continue . . .

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Screenshot

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Program

#Create a class
class Student:
    #Member variables
    Name=""
    StudentID=""
    GpaHours=0
    QualityPoints=0
    #Constructor
    def __init__(self,name,id,hrs,pnts):
        self.Name=name
        self.StudentID=id
        self.GpaHours=hrs
        self.QualityPoints=pnts
    #To string method
    def __str__(self):
        return("StudentName: "+self.Name+" StudentID: "+self.StudentID+" GpaHours: "+str(self.GpaHours)+" QualityPoints: "+str(self.QualityPoints))
    #Mutators
    def set_GpaHrs(self,hrs):
        self.GpaHours=hrs;
    def set_QualityPoints(self,pnt):
        if(pnts<=(4*self.GpaHours)):
            self.QualityPoints=pnt
        else:
            print("Error!!!!Quality points always less than 4 times of gpa hours. No change!!!")
    #Accessors
    def get_GpaHrs(self):
        return self.GpaHours;
    def get_QualityPoints(self):
        return self.QualityPoints;
    #Gpa calculation method
    def CalculateGpa(self):
        GPA=0.0
        if(self.QualityPoints==0):
            print("Divide by zer generate overflow, so return 0")
            return GPA
        else:
            GPA = self.GpaHours /self.QualityPoints
            return GPA
#Test
def main():
    student=Student("Michael John","M123",10,30)
    print(student)
    print("Student Gpa=%.2f"%(student.CalculateGpa()))
#Star
main()

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Output

StudentName: Michael John
StudentID: M123
GpaHours: 10
QualityPoints: 30
Student Gpa=0.33
Press any key to continue . . .