Write a program in java that prompts for an integer N (number of students) and M

Question

Write a program in java that prompts for an integer N (number of students) and M (number of test scores for each students), and allows the user to N*M real numbers.

The program then calculates the average for each student and class average.

(1) Prompt the user to input N students and M test scores, then display the inputs

Enter number of students: You entered: 2

Enter number of test scores: You entered: 3

Enter 6 real numbers:

You entered:

85.3 73.4 98.5

92.1 86.4 88.9

(2) Calculate the averages of each student

(3) Calcuate the class average

The class average is 87.43.

Explanation / Answer

import java.util.*;

import java.text.*;

class classScore{

public static void main(String srgs[]){

int n,m;

double sum=0,classSum = 0,classAvg;

Scanner sc=new Scanner(System.in);

DecimalFormat f = new DecimalFormat("##.00");

System.out.println("Enter number of students: ");

n=sc.nextInt();

System.out.println("Enter number of test scores: ");

m=sc.nextInt();

double scores[][]=new double[n][m];

double avg[]=new double[n];

System.out.println("Enter "+(n*m)+" real numbers:");

for(int i=0;i<n;i++)

{

for(int j=0;j<m;j++)

{

scores[i][j]=sc.nextDouble();

}

}

System.out.println("Enter number of students: You entered: "+n);

System.out.println("Enter number of test scores: You entered: "+m);

System.out.println("Enter "+(n*m)+" real numbers:");

System.out.println("You entered:");

for(int i=0;i<n;i++)

{

for(int j=0;j<m;j++)

{

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

sum=sum+scores[i][j];

}

avg[i]=sum/m;

sum=0;

System.out.println("");

}

System.out.println("There are "+n+" students.");

System.out.println("The averages for each student are");

for(int i=0;i<n;i++)

{

System.out.println(f.format(avg[i]));

classSum=classSum+avg[i];

}

classAvg=classSum/n;

System.out.println("The class average is "+f.format(classAvg));

}

}

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