Why is it giving me an error when i'm calling it from inside the 'student class?

2021-01-11 05:13 3jx imported from Stackoverflow

*I have to Create a class called student

• In the student class creates 5 instance variables to store student details for example name, age, grade, average term score and has a disability or not.

• Create a method that is accessible from only inside the class that displays all of the instance variables values.

• Create a mutator method ‘set grade’ that will update the value of grade instance variable

• Create an accessor ‘get grade’ to return the value of the grade variable*

but I'm getting an error and I didn't know how to complete the code, but what I did is:

public class Student {

String name;
private int age;
private int grade;
private int average;
private String disability;

public void StuInfo(){
name = "John";
age = 15;
grade = 71;
average = 63;
disability = "No";

    
System.out.println("Name: "+name+",Age: "+age+",Grade: "+grade+",Average: "+average );
}


public static void main(String[] args){
    StuInfo();
}
}

Please help.

2 answers

answered 2021-01-11 05:18 Satyendra Sharma
You are calling non static method from static method. Create object of StuInfo by -> new StuInfo();
answered 2021-01-11 05:38 Spyros K
In order to successfully compile your program you need to create first a new object of the class Student or make the stunInfo() method static. Also the java convention for method names is to start with a lowercase later, so StunInfo should better be named 'stunInfo'. A name like 'printStudentInfo()' can be considere, which would be even more readable and better shows what the method does. These notes can get your example working but it is not a complete solution to the homework posted. You need perhaps to change the access modifier of the stunInfo() method to be only accessible from within the class etc.
```
public class Student {

String name;
private int age;
private int grade;
private int average;
private String disability;

public void Student(){
  name = "John";
  age = 15;
  grade = 71;
  average = 63;
  disability = "No";
} // end constructor

public void stunInfo(){
    System.out.println("Name: "+name+",Age: "+age+",Grade: "+grade+",Average: "+average );
} //end stunInfo


public static void main(String[] args){
    //Create a new student
    Student student=new Student();
    //Invoke stunInfo method
    student.stunInfo();
} //end main

} //end class
```

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      while (turn < 10) {
         turn ++;
         
      Dice dice1;
      dice1 = new Dice();
      dice1.roll();
      
      Dice dice2;
      dice2 = new Dice();
      dice2.roll();
      
      Dice dice3;
      dice3 = new Dice();
      dice3.roll();
      
      Dice dice4;
      dice4 = new Dice();
      dice4.roll();
      
      Dice dice5;
      dice5 = new Dice();
      dice5.roll();
      }
   }
}
```
I am unsure exactly how to call the dicVal value from each of the dice in order to compare them. I was able to code something in the original file that would return the value, but there isn't supposed to be a return in the original, instead it should all be in the second file. Again, I'm sure this is something easy but after looking I can't figure out how to do it.
Strange Python 3 mod behavior for longs
Consider this code snippet.
```
>>> n, m = 10011617, 100000000000006340
>>> s = lambda n: n * (n + 1) / 2
>>> s(n)
50116242483153.0
>>> s(n) == int(s(n))
True
>>> m % s(n)
18096246116101.0
>>> m % int(s(n))
18096246116105
```
As you can see, s(n) is an integer (mathematically), yet m % s(n) != m % int(s(n)).

Could this have to do with s(n) or m being a long under the hood? Even if that's the case, why does s(n) == int(s(n)) yet when I take the modulus the results are not equal?

P.S. I ran this in repl.it

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