Question

Write a program to calculate students’ average test scores and their grades. You may assume the following data:

Johnson 85 83 77 91 76

Aniston 80 90 95 93 48

Cooper 78 81 11 90 73

Gupta 92 83 30 69 87

Blair 23 45 96 38 59

Clark 60 85 45 39 67

Kennedy 77 31 52 74 83

Bronson 93 94 89 77 97

Sunny 79 85 28 93 82

Smith 85 72 49 75 63

Use three arrays: a one-dimensional array to store the student names, a (parallel) two-dimensional array to store the test score, and a parallel one-dimensional array to store grades. Your program must contain at least the following methods: a method to read and store data into two arrays, a method to calculate the average test score and grade and a method to output the results. Have your program also output the class average.

Grade calculation to be computed as follows:

Marks	Grade
85-100	A
75-84	B
65-74	C
50-64	D
<50	F

* Java program free from syntax, logic and run time errors.

* Used methods, array parameters and keyboard input.

* Code optimisation: no unnecessary assignment of variables, calculations, parameters and loops

* Descriptive block and inline comments included.

Answer 1

code:

import java.util.*;
import java.io.*;
class StudentGrades
{
public static void readInput(int n,String names[],int score[][])//method to read input
{
Scanner sc=new Scanner(System.in);//scanner object to read input from keyboard
int i,j;
System.out.println("Enter student names followed by marks:");
for(i=0;i<n;i++)
{
names[i]=sc.next();//reading names form keyboard
for(j=0;j<5;j++)//reading marks of five subjects
score[i][j]=sc.nextInt();
}
}
public static double calculateAverage(int score[])//method to calculate average
{
double res=0;
for(int i=0;i<5;i++)//calculate sum of five subjects
{
res+=score[i];
}
res=res/5;//calculate average
return res;
}
public static char findGrade(int score[])//method to find Grade
{
//return appropriate grade based on average
double res=calculateAverage(score);//calculate average
if(res>=85)
return 'A';
else if(res>=75 && res<=84)
return 'B';
else if(res>=65 && res<=74)
return 'C';
else if(res>=50 && res<=64)
return 'D';
else
return 'F';
}
public static void outputResult(String names[],char res[],int n)//method to print result
{
for(int i=0;i<n;i++)
System.out.println(names[i]+":"+res[i]);
}
public static void main(String args[])//main code
{
System.out.print("Enter no of students:");
Scanner sc=new Scanner(System.in);//scanner object to read input from keyboard
int n=sc.nextInt();//reading number of students
String names[]=new String[n];//creating a array of strings
int score[][]=new int[n][5];//creating array of scores
readInput(n,names,score);
char res[]=new char[n];//creating array of characters
for(int i=0;i<n;i++)
res[i]=findGrade(score[i]);//finding the grade of student
System.out.println("Final Grades:");
outputResult(names,res,n);
}
}

code output:

it consists of four functions:

readInput

outputResult

findGrade

calculateAverage.

hope this helps you :)