Please help with how to do this exercise | Java Community | Help. Code. Learn. | Page 1

delicate hearthBOT Mar 17, 2023, 4:04 AM

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sinful pasture Mar 17, 2023, 4:11 AM

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Here is an updated one

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📎 Person.java

solid ferry Mar 17, 2023, 4:45 AM

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public int computeDiscountPercent()
{

 int discount = 0;
if ((this.student)&&(this.age>=10)&&(this.age <= 20))
discount = 50;

return discount;
}

public boolean isStudent()
{
return this.student;
}

public int getAge()
{
return this.age;
}

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You computeDiscountPercent function is correct but isStudent and age need to be returned like I mentioned above

sinful pasture Mar 17, 2023, 6:34 AM

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@solid ferry I run the code and I put age = 12

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but when I print The discount percent for this person is:" + discount + ".");

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the discount is 0

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it should be 50

solid ferry Mar 17, 2023, 6:35 AM

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did you also put person as a student ?

sinful pasture Mar 17, 2023, 6:36 AM

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I have this ```public class Person {

int age;
double weight;
boolean student;
char gender;

public Person(int age, double weight, boolean student, char gender )
{
this.age = age;
this.weight = weight;
this.student = student;
this.gender = gender;

}```

solid ferry Mar 17, 2023, 6:39 AM

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No I am asking are you putting person as a student while giving input

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Oh okay got it actually you need to create the object after taking the input and pass the variables in it

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You are using default constructor object which have all values as default i.e. 0

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Try creating the object after taking input by using this constructor
public Person(int age, double weight, boolean student, char gender )
{
this.age = age;
this.weight = weight;
this.student = student;
this.gender = gender;

}

sinful pasture Mar 17, 2023, 8:15 AM

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@solid ferry I have put the constructor with 4 parameters

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how come discount doesn't become 50

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when i put age as 12

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or sth between 10 to 20

solid ferry Mar 17, 2023, 8:16 AM

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bro you are using the default constructor for your object try this

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System.out.print("Please enter the person's age:");
int age = scan.nextInt();
System.out.print("Please enter the person's weight:");
double weight = scan.nextDouble();
System.out.print("Is the person a student (true/false):");
boolean student = scan.nextBoolean();
System.out.print("Please enter the person's gender (M/F):");
char gender = scan.next().charAt(0);
System.out.println("Person: age: " + age + " weight: " + weight + "retired: " + student + "gender " + gender +"");
Person p1 = new Person(age,weight,student,gender);
int discount = p1.computeDiscountPercent();
p1.isStudent();
p1.getAge();

scan.close();
}

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See here we are creating the object (p1) with the constructor having four parameters earlier you are creating the object using default constructor

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I hope this make sense to you

sinful pasture Mar 17, 2023, 8:55 AM

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@solid ferry why did you put the four variables in Person(age,weight,student,gender);

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also are the methods for isStudent and getAge the correct approach according to the exercise

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its confusing

solid ferry Mar 17, 2023, 8:57 AM

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Becuase we want to set the values of all these varaibles in Person class

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Yes in this way they are correct
public boolean isStudent()
{
return this.student;
}

public int getAge()
{
return this.age;
}

sinful pasture Mar 17, 2023, 8:58 AM

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oh huh ... okay

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i think it makes sense

solid ferry Mar 17, 2023, 8:58 AM

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Yup earlier you are using the object in which you are not passing the values so you are seeing zero as discount

sinful pasture Mar 17, 2023, 8:59 AM

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okay ... i think i understand now

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just wondering if the output console is suppose to show True later on

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because the exercise says //returns true if this Person is a student and false otherwise

solid ferry Mar 17, 2023, 9:01 AM

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Yup it will return whatever the input you will give

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But since you are taking input as boolean make sure to give input as 0 or 1

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Or you can do something like this

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System.out.print("Is the person a student (T/F):");
char isStudentIsPerson = scan.next().charAt(0);
boolean student = false;
if(isStudentIsPerson == 'T') {
student = true;
}
else {
student = false;
}

sinful pasture Mar 17, 2023, 9:04 AM

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okay

solid ferry Mar 17, 2023, 9:04 AM

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Wait I'm editing that

solid ferry Mar 17, 2023, 9:06 AM

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solid ferry System.out.print("Is the person a student (T/F):"); char isStudentIsPerson = sca...

We can do like this as well

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So if you give input as T student variable value is assigned as true

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Else false

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Or if you want the boolean input you can simply do
System.out.print("Is the person a student (0/1):");
boolean student = scan.nextBoolean();

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Let me know if it works or not

sinful pasture Mar 17, 2023, 9:11 AM

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it doesn't work

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@solid ferry Can I send you another exercise I am working on?

solid ferry Mar 17, 2023, 10:19 AM

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Yup

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For me it's working didn't know why not working for you

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public class Person {

    int age;
    double weight;
    boolean student;
    char gender;

    // constructor with inputs to initialise all four instance variables
    public Person(int age, double weight, boolean student, char gender) {
        this.age = age;
        this.weight = weight;
        this.student = student;
        this.gender = gender;

    }

    // default constructor
    public Person() {
        this.age = 0;
        this.weight = 0;
        this.student = false;
        this.gender = 0;
    }

    public int computeDiscountPercent() {

        int discount = 0;
        if ((this.student) && (this.age >= 10) && (this.age <= 20))
            discount = 50;
        return discount;
    }

    public boolean isStudent() {
        return this.student;
    }

    public int getAge() {
        return this.age;
    }

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        System.out.print("Please enter the person's age:");
        int age = scan.nextInt();
        System.out.print("Please enter the person's weight:");
        double weight = scan.nextDouble();
        System.out.print("Is the person a student (T/F):");
        char isStudentPerson = scan.next().charAt(0);
        boolean student = false;
        if(isStudentPerson == 'T') {
            student = true;
        }
        else {
            student = false;
        }
        System.out.print("Please enter the person's gender (M/F):");
        char gender = scan.next().charAt(0);
        System.out.println(
                "Person: age: " + age + " weight: " + weight + "retired: " + student + "gender " + gender + "");
        Person p1 = new Person(age,weight,student,gender);        
        int discount = p1.computeDiscountPercent();
        System.out.println(discount);
        System.out.println(p1.isStudent());
        System.out.println(p1.getAge());

        scan.close();
    }

}

delicate hearthBOT Mar 17, 2023, 3:40 PM

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#Please help with how to do this exercise