Answer to Question #247029 in Java | JSP | JSF for maria

Question

consider an array MARKS [20] [5] which stores the marks obtained by 20 students in 5 subjects. now write a program.

(a.) find the average marks obtained in each subject.

(b.)find the average marks obtained by every student

(c.) find the number of students who have scored below 50 in their average.

(d.) display the scores obtained by every student.

Answer 1

package studentmarks;




public class StudentMarks {


    
    public static void main(String[] args) {
        
       int [][]  MARKS = {{48,27,10,67,18}, {58,89,40,80,78},{47,40,49,78,40},{69,40,89,88,67},
                        {38,91,76,34,67},{66,45,89,34,90}, {97,78,90,67,56},{57,78,90,87,76},
                        {77,98,50,57,46}, {57,98,70,67,86}, {77,68,70,67,56}, {97,98,90,67,56},
                        {67,78,90,67,56}, {27,48,60,87,56},{17,58,90,97,86}, {67,78,90,67,56},
                        {37,58,90,67,56}, {77,78,70,67,66}, {67,78,90,67,56}, {97,88,90,67,76}};
       
       float total = 0;
float average = 0;
//Part a
System.out.println("Average marks for each subject\n");
System.out.println("Subject     \tAverage\n");
int [] student = new int [100];
int n  = 0;
for(int i=0; i<20; i++){
    for(int j=0; j<5; j++){
        student[n++] = MARKS[i][j];
    }
}
int [][] marks = new int[5][20];
int k = 0;
for(int i=0; i<5; i++){
    for(int j=0; j<20; j++){
        marks[i][j] = student[k++];
    }
}












for (int i = 0; i < 5; i++)
{
   for (int j = 0; j < 20; j++)
   {
       total += marks[i][j];
   }
   average = total/20;
 System.out.printf("%d\t\t %f\n", (i+1), average);
   
   
   average = 0;
   total = 0;
}
int count =0;
double [] averageScore = new double[20];
//Part b Answer
System.out.println("Average marks for every student\n");
System.out.println("Student     \tAverage\n");


for(int i=0; i<20; i++){
	float sum = 0;
	for(int j=0; j<5; j++){
		sum +=  MARKS[i][j];
	}
        System.out.printf("%d     \t\t%f\n", (i+1), (sum / 5 ));
	
	averageScore[i] = sum / 5;
}
for(int i=0; i<20; i++){
if(averageScore[i]<50){
	count++;
}
}
//Part (c) answer
System.out.printf("The number of students with average less than 50: %d\t", count);


//Part (d) answer
System.out.printf("Average marks obtained by every student\n");
System.out.printf("Student     \tScores\n");




for(int i=0; i<20; i++){
    System.out.printf("%d:   \t\t  %f \n", (i+1), (averageScore[i] * 5 ));
	
}


}
    
    
    
}