calculation float problem, and alot of errors and been trying to fix this problems for days.

[Ricardo Arteaga]

The requirements are:
•Write an application that will allow a user to input (use dialog boxes) the parent's heights and then outputs the predicted height as a range
•Implement a person class that has:
attributes for gender and height,
a constructor with two parameters (gender and height),
a constructor with one parameter (gender),
a constructor with one parameter (height),

import javax.swing.*;
import java.util.*;
import java.awt.*;

public class Person 
{
   String gender, Gender;
   int height, Height;
  
   
   public Person()
    {
        gender = Gender;
        height = Height;
    }

   public Person (String gender, int height)
    {
        this.gender = Gender;
        this.height = height;        
    }
        
   public String getGender()
    {
       return gender;
    }
    
   public void setGender (String gender)
    {
        this.gender = Gender;
    }
    
   public int getHeight()
    {
        return Height;
    }
    
   public void setHeight(Person height)
    {
        this.height = Height;
    }      
    
   public float calcAverage(Person height)
    {
    Height = height.getHeight();
    return Height;
   }
}

import java.util.*;
import javax.swing.*;

public class ChildHeightPredictor extends Person
{
  int motherHeight;
  int fatherHeight;
  int fatherInch;
  int motherInch;
  float feetMaleChild;
  float InchMaleChild;
   //float calcAverage;
   
  public void setHeight(Person height)
   {
       String mother_feet = JOptionPane.showInputDialog("Enter mother's height (only FT)");            //height = Integer.parseInt(height);
       String mother_inches = JOptionPane.showInputDialog("Enter mother's height (only Inch)");
       String  father_feet = JOptionPane.showInputDialog("Enter father's height in FEET)");  
       String  father_inches = JOptionPane.showInputDialog("Enter father's height in inches) ");
       
       motherHeight = height.getHeight();
       fatherHeight = height.getHeight();
       
       int motherHeight = Integer.parseInt(mother_feet); 
       int motherInch = Integer.parseInt(mother_inches);                               //int mother_height = height.getHeight();//(int3*12)+int4;
       int fatherHeight = Integer.parseInt(father_feet);  
       int fatherInch = Integer.parseInt(father_inches);    
                                                                                      // int father_height = height.getHeight();//(int1*12)+int2;
   }
   
   public static void main(String[] args) { 
       //int motherHeight;
       //int fatherHeight;
       float feetMaleChild;
       float InchMaleChild;
       float average; 
       //int child_total_inches;
       String male;
       String female;
       
       
       String gender;
       String Gender;
       //Person s = new Person();
       
       do{
           gender = JOptionPane.showInputDialog("Enter the gender of the child. ");
           if (gender.equals("male")){
               // Male child formula
        error--->       average = (((float)feetMaleChild + (float)InchMaleChild/2));      
               //  String motherFeet = JOptionPane.showInputDialog("Enter mother's height (only FT)");  
           //String mother_inches = JOptionPane.showInputDialog("Enter mother's height (only Inch)");
        //   motherHeight = Integer.parseInt(motherFeet); 
         //  int int4 = Integer.parseInt(mother_inches);
         //  motherHeight = (motherHeight*12)+int4;

          // String  father_feet = JOptionPane.showInputDialog("Enter father's height in FEET)");  
           //String  father_inches = JOptionPane.showInputDialog("Enter father's height in inches) ");
         //  int int1 = Integer.parseInt(father_feet);  
         //  int int2 = Integer.parseInt(father_inches);  
         //  fatherHeight = (int1*12)+int2;
               JOptionPane.showMessageDialog(null, "Child's Predicted Height is: " 
               + average); 
               //child_total_inches = ((average * 13 / 12)
              // + fatherHeight)/2;
            }else{
                // Female child formula
                 average = (((float)feetMaleChild + (float)InchMaleChild/2));
               // + motherHeight)/2;
            }
            JOptionPane.showMessageDialog(null, "Your child is estimated to grow to " +
            //child_total_inches 
            average / 12 + " feet and " +
            //child_total_inches 
            average % 12 + " inches.");
           break;
       }while(true);
  }
   } 

[Ulf Dittmer]

Lines 7 and 8 of class Person, and lines 42 and 43 of class ChildHeightPredictor are, sorry for the harsh word, terrible. Never, ever use two variables with the same name that differ only in capitalization. Remove the uppercase version, you don't need them. Then fix the compilation errors you will get afterwards.

Next, the setHeight and calcAverage methods take a Person parameter - I'm not sure what calcAverage should be taking, but setHeight should work analogous to setGender.

Now we're getting to the error in line 50 of ChildHeightPredictor. The problem is you're using variables before assigning values to them. At that point in the code, you can't calculate anything, because only the gender of the child has been entered. So it seems the entire logic needs to be reworked.

[Ricardo Arteaga]

public Person()
    {
        gender = gender;
        height = height;
    }

   public Person (String gender, int height)
    {
        this.gender = gender;
        this.height = height;        
    }
        
   public String getGender()
    {
       return gender;
    }
    
   public void setGender (String gender)
    {
        this.gender = gender;
    }
    
   public int getHeight()
    {
        return height;
    }
    
   public void setHeight(Person height)
    {
    // this.height = height;
    }      

okay i fixed this, so far the calAverage should be a float to basically calculate the child height in decimal but iono how do that correctly.

[Ricardo Arteaga]

for childHeightPredictor how can i work on the logic because i do not know where to start?
i did two integers for father and mother and parse them. But i dono if i need to turn double to float,
is there a guide or video that explain the logic correctly.

[Ulf Dittmer]

That code is much better. You can remove lines 3 and 4, they don't do anything. Line 30 is correct, but in line 28, height is an int, not a Person.

What is the formula for calculating the expected child height? Does it depend on the gender? If so, how?

[Ricardo Arteaga]

but basically when user enter female and adds value it should tell you the height value in float
or if user enter male tell height value in float based on gender.

The objective of my program is : For our next programming assignment we will write
an application that uses a relatively simply
predictive approach that is actually quite good:

1.Find the average of the parents’ height by
adding together the mother’s and father’s height
(either in inches or centimeters) and dividing by 2.

2.To calculate the height of a boy, add 2.5 inches
(6.5 centimeters) to the average of the parents’
height. To calculate the height of a girl,
subtract 2.5 inches (6.5 centimeters) to the
average of the parents’ height.

3.The resulting number is the “mid-parental height”
for girls or boys. The child’s adult height can be
expected to fall within a range of 4 inches
(10 centimeters) less or more than the
mid-parental height.

The requirements are:

•Write an application that will allow a user to
input (use dialog boxes) the parent's heights and
then outputs the predicted height as a range

•Implement a person class that has:

•attributes for gender and height,

•a constructor with two parameters (gender and height),

•a constructor with one parameter (gender),

•a constructor with one parameter (height),

•a default constructor,

•methods to get and set the attributes, and

•a method that accepts two parameters (Person objects)
and returns the estimated height as a float


I remember if it is a female child you subtract the age. if it is a boy child it is added.
------------------------------------------------------------------------------------------------------------------------------

i found this link that explains it: https://coderanch.com/t/569079/java/java/loops

int heightMother, heightFather;  
    int heightMaleChild, heightFemaleChild;  
    String gender;  
      
    System.out.println("Enter gender using 'male' or 'female'. Enter stop");  
    System.out.println("to quit:");  
    gender = keyboard.nextLine( );  
    System.out.println(" ");  
    while(!gender.equalsIgnoreCase("stop"))  
        {  
        System.out.println("Enter father's height, feet first then inches,");  
        System.out.println("Seperate feet and inches by a space.");  
        int feetFather, inchesFather;  
        feetFather = keyboard.nextInt( );  
        inchesFather = keyboard.nextInt( );  
        heightFather = (feetFather * 12) + inchesFather;  
        System.out.println(" ");  
          
        System.out.println("Enter mother's height, feet first then inches,");  
        System.out.println("Seperate feet and inches by a space.");  
        int feetMother, inchesMother;  
        feetMother = keyboard.nextInt( );  
        inchesMother = keyboard.nextInt( );  
        heightMother = (feetMother * 12) + inchesMother;  
        System.out.println(" ");  
          
        if ((gender.equalsIgnoreCase("male")) == true)  
        {  
            int feetMaleChild;  
            int inchesMaleChild;  
            heightMaleChild = ((heightMother * (13 / 12)) + heightFather) / 2;  
            feetMaleChild = heightMaleChild / 12;  
            inchesMaleChild = heightMaleChild % 12;   
     
            System.out.println("Estimated height of male child, will be: "   
                              + feetMaleChild + " feet & " + inchesMaleChild   
                              + " inches.");  
                  
        }  
        else if ((gender.equalsIgnoreCase("female") == true))  
        {  
            int feetFemaleChild;  
            int inchesFemaleChild;  
            heightFemaleChild = ((heightFather * (12 / 13)) + heightMother) / 2;  
            feetFemaleChild = heightFemaleChild / 12;  
            inchesFemaleChild = heightFemaleChild % 12;   
              

[Ricardo Arteaga]

fix the line

public void setHeight(int height)
    {
     this.height = height;
    }      

and delete java.awt