I keep getting an error. I asked a question yesterday and it was posted but I ge
ID: 3818683 • Letter: I
Question
I keep getting an error. I asked a question yesterday and it was posted but I get an error What am I doing wrong. Also I am to drop the lowest score when I determine the grade. This one counts all scores. thanks Here is my program and my issues. +++++++++++++++++++++++++++ public class MyClass { private String [] names; //names of the studi (sorry a fall back on a former life) private char [] grades; // self explanatory private int [][] scores; //one for the gipper //To my class and to initialize the new vaiables public MyClass() { names=new String[5]; grades=new char[5]; scores=new int[5][4]; } // to return names public String[] getNames() { return names; } // to return the grade... but not stats public char[] getGrades() { return grades; } // to return the scores public int[][] getScores() { return scores; } //To display details of 5 students public void displayDetails() { int avg,sum; System.out.println(" ************ Details Entered Are ************"); for(int i=0;i<5;i++){ avg=0; sum=0; for(int j=0;j<4;j++){ sum+=scores[i][j]; } //sum contains total of 4 scores //Calculating average using sum avg=sum/4; System.out.println("Student Name:"+names[i]+" Average Score:"+avg+" Grade Scored:"+grades[i]); } } public String getStudentByName(String name) { //As specified,a method to return details of a given Student for (int i = 0; i < names.length; i++) { if(names[i].equalsIgnoreCase(name)){ //If the Student name matches in the stored names float avg=0.0f; for (int j = 0; j < 4; j++) { avg+=scores[i][j]; } avg=avg/4; //Calculated the average return "Student Name:"+names[i]+" Average Score:"+avg+" Grade:"+grades[i]; //It will return the details as the student was found } } return "Student not available"; //If Student is not found in the Stored array } } +++++++++++++++++++++++++++ package util; import java.util.Scanner; // for scanner import still not worthy import java.util.Collections; // wahoo a new util i found that did my trick public class ClassDemo { // i had have not idea what i should call this public static void main(String[] args) { // for the scanner class Scanner sc = new Scanner(System.in); MyClass c1 = new MyClass(); //For local purpose double avg,sum; //To get instance variables of MyClass object String [] names; char [] grades; int [][] scores; grades=c1.getGrades(); names=c1.getNames(); scores=c1.getScores(); //To get details from User for 5 Students: for(int i=0;i<5;i++){ System.out.println("Enter details of Student "+(i+1)+":-"); System.out.println("Enter name:"); names[i]=sc.next(); avg = 0; sum=0; int low = 100; int score=0; for(int j=0;j<4;j++){ System.out.println("Enter Score:"+(j+1)); score=sc.nextInt(); //Validating Score reallly had an issue with this not sure why if(score <0 || score >100) { System.out.println("Invalid Score try again..."); j--; //Setting j back by 1 as this was wrong entry - found out this was a big issue... dumb! continue; } else { if(score=90 && avg<=100){ grades[i]='A'; }else if(avg>=80 && avg<=89){ grades[i]='B'; }else if(avg>=70 && avg<=79){ grades[i]='C'; }else if(avg>=60 && avg<=69){ grades[i]='D'; }else if(avg>=0 && avg<=59){ grades[i]='F'; } } } public static double calculateAvg(int inputs[], int lowNum) { double sum = 0; double avg = 0; int i = 0; // Calcuates the average of the array list with the lowest numbers dropped for (i = 0; i < inputs.length; i++) { if (inputs[i] > lowNum) { sum = sum + inputs[i]; } } avg = (sum / inputs.length); System.out.println(avg); return avg; } } +++++++++++++++++++++++++++ ClassDemo.java:17: error: cannot find symbol MyClass c1 = new MyClass(); ^ symbol: class MyClass location: class ClassDemo ClassDemo.java:17: error: cannot find symbol MyClass c1 = new MyClass(); ^ symbol: class MyClass location: class ClassDemo 2 errors ----jGRASP wedge2: exit code for process is 1. ----jGRASP: operation complete. My stupis errors they are in the same folder. And i tried to change wording but that didnt work, so I am at a loss. thanks ahead of time
Explanation / Answer
MyClass.java
public class MyClass {
private String[] names; // names of the studi (sorry a fall back on a former life)
private char[] grades; // self explanatory
private int[][] scores; // one for the gipper
// To my class and to initialize the new vaiables
public MyClass() {
names = new String[5];
grades = new char[5];
scores = new int[5][4];
}
// to return names
public String[] getNames() {
return names;
}
// to return the grade... but not stats
public char[] getGrades() {
return grades;
}
// to return the scores
public int[][] getScores() {
return scores;
}
// To display details of 5 students
public void displayDetails() {
int avg, sum;
System.out.println(" ************ Details Entered Are ************");
for (int i = 0; i < 5; i++) {
avg = 0;
sum = 0;
for (int j = 0; j < 4; j++) {
sum += scores[i][j];
}
// sum contains total of 4 scores
// Calculating average using sum
avg = sum / 4;
System.out.println("Student Name:" + names[i] + " Average Score:"
+ avg + " Grade Scored:" + grades[i]);
}
}
public String getStudentByName(String name) {
// As specified,a method to return details of a given Student
for (int i = 0; i < names.length; i++) {
if (names[i].equalsIgnoreCase(name)) {
// If the Student name matches in the stored names
float avg = 0.0f;
for (int j = 0; j < 4; j++) {
avg += scores[i][j];
}
avg = avg / 4; // Calculated the average
return "Student Name:" + names[i] + " Average Score:" + avg
+ " Grade:" + grades[i];
// It will return the details as the student was found
}
}
return "Student not available"; // If Student is not found in the Stored
// array } }
}
public void setNames(String names, int i) {
this.names[i] = names;
}
public void setGrades(char grade, int i) {
this.grades[i]= grade;
}
public void setScores(int scores, int i, int j) {
this.scores[i][j] = scores;
}
}
ClassDemo.java
import java.util.Scanner; // for scanner import still not worthy
import java.util.Collections; // wahoo a new util i found that did my trick
public class ClassDemo {
// i had have not idea what i should call this
public static void main(String[] args) {
// for the scanner class
Scanner sc = new Scanner(System.in);
MyClass c1 = new MyClass(); // For local purpose
double avg, sum; // To get instance variables of MyClass object
String[] names;
char[] grades;
int[][] scores;
grades = c1.getGrades();
names = c1.getNames();
scores = c1.getScores(); // To get details from User for 5 Students:
for (int i = 0; i < 5; i++) {
System.out.println("Enter details of Student " + (i + 1) + ":-");
System.out.println("Enter name:");
names[i] = sc.next();
c1.setNames(names[i], i);//setting the name;
avg = 0;
sum = 0;
int low = 100;
int score = 0;
for (int j = 0; j < 4; j++) {
System.out.println("Enter Score:" + (j + 1));
score = sc.nextInt();
// Validating Score reallly had an issue with this not sure why
if (score < 0 || score > 100) {
System.out.println("Invalid Score try again...");
j--; // Setting j back by 1 as this was wrong entry - found
// out this was a big issue... dumb!
continue;
} else {
c1.setScores(score, i, j);//sets scores
if(low>score){
low=score;
}
}
}
scores=c1.getScores();
avg=calculateAvg(scores[i], low);
if (avg == 90 && avg <= 100) {
grades[i] = 'A';
} else if (avg >= 80 && avg <= 89) {
grades[i] = 'B';
} else if (avg >= 70 && avg <= 79) {
grades[i] = 'C';
} else if (avg >= 60 && avg <= 69) {
grades[i] = 'D';
} else if (avg >= 0 && avg <= 59) {
grades[i] = 'F';
}
c1.setGrades(grades[i], i);
}
c1.displayDetails();
}
public static double calculateAvg(int inputs[], int lowNum) {
double sum = 0;
double avg = 0;
int i = 0;
// Calcuates the average of the array list with the lowest numbers
// dropped
for (i = 0; i < inputs.length; i++) {
if (inputs[i] > lowNum) {
sum = sum + inputs[i];
}
}
avg = (sum / inputs.length);
//System.out.println(avg);
return avg;
}
}
------------------output-----------------
Enter details of Student 1:-
Enter name:
a
Enter Score:1
10
Enter Score:2
20
Enter Score:3
30
Enter Score:4
40
Enter details of Student 2:-
Enter name:
b
Enter Score:1
10
Enter Score:2
20
Enter Score:3
30
Enter Score:4
40
Enter details of Student 3:-
Enter name:
c
Enter Score:1
10
Enter Score:2
20
Enter Score:3
30
Enter Score:4
40
Enter details of Student 4:-
Enter name:
d
Enter Score:1
10
Enter Score:2
20
Enter Score:3
30
Enter Score:4
40
Enter details of Student 5:-
Enter name:
e
Enter Score:1
10
Enter Score:2
20
Enter Score:3
30
Enter Score:4
40
************ Details Entered Are ************
Student Name:a Average Score:25 Grade Scored:F
Student Name:b Average Score:25 Grade Scored:F
Student Name:c Average Score:25 Grade Scored:F
Student Name:d Average Score:25 Grade Scored:F
Student Name:e Average Score:25 Grade Scored:F
----------------output----------------------
Note: please keep both files in the same folder. also i have updated the program based on your requirement. Please let me know if you face any issue. God bless you!!