import java.util.Scanner;
public class scores
{
static Scanner input = new Scanner(System.in);
public static void main(String[] args)
{
System.out.print("\f");
int classSize, counterScore, counterName;
String name;
double score,average, sum;
System.out.print("Enter size of class: ");
classSize = input.nextInt();
int[] scoreArray = new int[classSize];
String[] nameArray = new String[classSize];
counterScore=1;
counterName = 1;
average = 0;
sum = 0;
for (int x = 0; x < classSize; x++)
{
input.nextLine();
System.out.print("Student " + counterName++ + " Name: ");
nameArray[x] = input.nextLine();
System.out.print("Student " + counterScore++ + " Score: ");
scoreArray[x] = input.nextInt();
sum = sum + scoreArray[x];
average = sum / classSize;
}
System.out.println(average);
}
}
I have to make an app that allows me to say how many people took a test and then enter their names and scores. I have used two different arrays as one is a string and one a double. My output is meant to read which names got under the average and display the name. I do not know how to combine the two arrays so that it recognizes that this score is related to this name so display that name.
I think your best option is to create a POJO with two fields (name and score) and create an array of it:
public class Student {
private String name;
private int score;
public Student(String name, int score) {
this.name = name;
this.score = score;
}
public String getName() {
return name;
}
public int getScore() {
return score;
}
}
You can simply iterate through the two arrays together in a single iteration and populate an array of the custom type containing a String and double. (ie a Student class)
public class Student {
public String name;
public double score;
public Student(String name, double score) {
this.name = name;
this.score = score;
}
}
List<Student> students = new ArrayList<Student>();
for (int x = 0; x < classSize; x++)
{
input.nextLine();
System.out.print("Student " + counterName++ + " Name: ");
nameArray[x] = input.nextLine();
System.out.print("Student " + counterScore++ + " Score: ");
scoreArray[x] = input.nextInt();
sum = sum + scoreArray[x];
average = sum / classSize;
// populate array of student
students.add(new Student(nameArray[x], scoreArray[x]));
}
Note that in this case, you don't need to have the scoreArray
and nameArray
anymore for better memory utilization.
You can use (add this after your first loop):
for (int i = 0; i < classSize; i++)
{
if(scoreArray[i] < average) {
System.out.println(nameArray[i])
}
}
Or if you want it all on one line:
System.out.println("The following students are below average: ")
boolean first = true;
for (int i = 0; i < classSize; i++)
{
if(scoreArray[i] < average) {
if(!first) {
System.out.println(", ");
first = false;
}
System.out.print(nameArray[i])
}
}
Also, you should move the line average = sum / classSize;
outside of your loop, there's no point in re-calculating the average each time.
To find out the highest value, keep a temporary variable for the name and another for the highest value, and loop through the students:
String highestName = "";
double highestValue = 0;
for (int i = 0; i < classSize; i++) {
if(scoreArray[i] > highestValue) {
highestName = nameArray[i];
highestValue = scoreArray[i];
}
}
System.out.println(highestName + " has the highest grade.")
Or use this to print more than one student if there's a tie:
String[] highestNames = new String[classSize];
int numHighest = 0;
double highestValue = 0;
for (int i = 0; i < classSize; i++) {
if(scoreArray[i] > highestValue) {
highestNames[0] = nameArray[i];
numHighest = 1;
highestValue = scoreArray[i];
} else if(scoreArray[i] > highestValue) {
highestNames[numHighest] = nameArray[i];
numHighest = numHighest + 1;
}
}
System.out.println("The following student(s) has/have the highest grade: ")
boolean first2 = true;
for (int i = 0; i < numHighest; i++)
{
if(!first2) {
System.out.println(", ");
first2 = false;
}
System.out.print(highestNames[i])
}
}
You can also combine the content of the loop for printing students with grades below average with the one for finding the highest grades to make your program more efficient:
String[] highestNames = new String[classSize];
int numHighest = 0;
double highestValue = 0;
System.out.println("The following students are below average: ")
boolean first = true;
for (int i = 0; i < classSize; i++)
{
if(scoreArray[i] < average) {
if(!first) {
System.out.println(", ");
first = false;
}
System.out.print(nameArray[i])
}
if(scoreArray[i] > highestValue) {
highestNames[0] = nameArray[i];
numHighest = 1;
highestValue = scoreArray[i];
} else if(scoreArray[i] > highestValue) {
highestNames[numHighest] = nameArray[i];
numHighest = numHighest + 1;
}
}
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