Question

Write a program to input marks in Eng, Science and Maths by using three single dimensional arrays . Calculate and Print the following information s
1 - average marks secured by each student
2- class average in each subject (class average is the average marks obtained by the students in a particular subject

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Answer 1

Explanation:

import java.util.Scanner;

public class KboatSDAMarks

{

public void computeStudentNClassAverage() {

final int TOTAL_STUDENTS = 40;

Scanner in = new Scanner(System.in);

int english[] = new int[TOTAL_STUDENTS];

int maths[] = new int[TOTAL_STUDENTS];

int science[] = new int[TOTAL_STUDENTS];

double avgMarks[] = new double[TOTAL_STUDENTS];

for (int i = 0; i < TOTAL_STUDENTS; i++) {

System.out.println("Enter student " + (i+1) + " details:");

System.out.print("Marks in English: ");

english[i] = in.nextInt();

System.out.print("Marks in Maths: ");

maths[i] = in.nextInt();

System.out.print("Marks in Science: ");

science[i] = in.nextInt();

avgMarks[i] = (english[i] + maths[i] + science[i]) / 3.0;

}

int engTotal = 0, mathsTotal = 0, sciTotal = 0;

for (int i = 0; i < TOTAL_STUDENTS; i++) {

System.out.println("Average marks of student " + (i+1) + " = " + avgMarks[i]);

engTotal += english[i];

mathsTotal += maths[i];

sciTotal += science[i];

}

System.out.println("Class Average in English = " + ((double)engTotal / TOTAL_STUDENTS));

System.out.println("Class Average in Maths = " + ((double)mathsTotal / TOTAL_STUDENTS));

System.out.println("Class Average in Science = " + ((double)sciTotal / TOTAL_STUDENTS));

}

}

Output

BlueJ output of KboatSDAMarks.java

BlueJ output of KboatSDAMarks.java

Question 10

Write a program in Java to accept 20 numbers in a single dimensional array arr[20]. Transfer and store all the even numbers in an array even[ ] and all the odd numbers in another array odd[ ]. Finally, print the elements of both the arrays.

import java.util.Scanner;

public class KboatSDAEvenOdd

{

public void segregateEvenOdd() {

final int NUM_COUNT = 20;

Scanner in = new Scanner(System.in);

int i = 0;

int arr[] = new int[NUM_COUNT];

int even[] = new int[NUM_COUNT];

int odd[] = new int[NUM_COUNT];

System.out.println("Enter 20 numbers:");

for (i = 0; i < NUM_COUNT; i++) {

arr[i] = in.nextInt();

}

int eIdx = 0, oIdx = 0;

for (i = 0; i < NUM_COUNT; i++) {

if (arr[i] % 2 == 0)

even[eIdx++] = arr[i];

else

odd[oIdx++] = arr[i];

}

System.out.println("Even Numbers:");

for (i = 0; i < eIdx; i++) {

System.out.print(even[i] + " ");

}

System.out.println("\nOdd Numbers:");

for (i = 0; i < oIdx; i++) {

System.out.print(odd[i] + " ");

}

}

}

Output