Java Classes & Objects

Question

How do we calculate the average marks of s, s1, s2 & s3

class Test{

public static void main(String args[]){

Student s;

s = new Student();

s.name='A';

s.age=23;

s.marksMaths=67;

s.marksEnglish=84;

System.out.println(s.name);

System.out.println(s.age);

System.out.println(s.marksMaths);

System.out.println(s.marksEnglish);

System.out.println(s.average);

Student s1;

s1 = new Student();

s1.name='B';

s1.age=34;

s1.marksMaths=45;

s1.marksEnglish=88;

Student s2;

s2 = new Student();

s2.name='C';

s2.age=22;

s2.marksMaths=29;

s2.marksEnglish=93;

Student s3;

s3 = new Student();

s3.name='D';

s3.age=17;

s3.marksMaths=74;

s3.marksEnglish=38;

}

}

Answer 1

class Student

{

private String name;

private int age;

private double marksMath;

private double marksEnglish;

Student( String Name, int Age, double math, double english)

{

name = Name;

age = Age;

marksMath = math;

marksEnglish = english;

}

String GetName() { return(name); }

int GetAge() { return(age); }

double GetMathGrade() { return(marksMath); }

double GetEnglishGrade() { return(marksEnglish); }

double GetGradeAverage() { return( (marksEnglish+marksMath)/2); }

void Display ( String debugMsg)

{

System.out.println(" ****************************************************");

if (debugMsg!=null)

{

System.out.println("******************************************************");

System.out.println(debugMsg);

}

System.out.println(" name = >"+name+"<");

System.out.println(" age = " + age);

System.out.println(" math grade = "+marksMath);

System.out.println(" english grade = "+marksEnglish);

System.out.println(" grade average = " + this.GetGradeAverage() );

}

public static void main(String args[])

{

Student s = new Student("A",23,67,84);

Student s1 = new Student("B",34,45,88);

Student s2 = new Student("C",22,29,93);

Student s3 = new Student("D",17,74,38);

Student studentArray[] = new Student[4];

studentArray[0] = s;

studentArray[1] = s1;

studentArray[2] = s2;

studentArray[3] = s3;

String outbuff;

for (int iLoop=0; iLoop<4; iLoop++)

{

outbuff = "Student rec # "+ (iLoop+1);

studentArray[iLoop].Display(outbuff);

}

System.out.println("\n grades are \n");

double totalMath=0;

double totalEnglish=0;

double totalAvg = 0;

int N = studentArray.length;

System.out.println(" student math english avg ");

for (int iLoop=0; iLoop<N; iLoop++)

{

Student curStudent = studentArray[iLoop];

double math = curStudent.GetMathGrade();

double english = curStudent.GetEnglishGrade();

double avg = curStudent.GetGradeAverage();

totalMath += math;

totalEnglish += english;

totalAvg += avg;

System.out.println(" "+ curStudent.GetName() + " " + math + " " + english + " " + avg);

}

System.out.println("TOTALS: "+ totalMath + " " + totalEnglish + " " + totalAvg);

System.out.println(" AVERAGE: " + totalMath/N + " " + totalEnglish/N + " " + totalAvg/N);

}