i need help writing a program using array. ASAP!

[ello]

Write a Java application that does the following:
 Reads an integer from the user represents the number of the students in a class.
 Reads the scores of the students from the user and store them in an array.
 Calculates and prints the percentage of the excellent students in the class rounded
to 1 decimal place.

please i am new at programming and have to submit this assignment by tomorrow.. so can how how to write.. coz the way i am using it keeps messing up at the declaring Array time

[keang]

Show what you have done and we can guide you in correcting it but we won't write it for you.

[ello1]

this what i have so far.. i just started java this semester so i bet its full of mistakes.

import java.util.Scanner;
public class Q7_A_112532 {
public static void main(System[] args){
Scanner input = new Scanner(System.in);
int num = 0;
int excellentstudent;
excellentstudent = 0;
double percentage = 0;

System.out.print("enter the total number of students: ");
num = input.nextInt();

int[] studentarray;
studentarray = new.int[num];
{for (i = 0; i < studentarray.lenght, i++ )
sum = sum + arr[num]
}
if (grade >= 90 )
gradecount ++;

percentage = count * 100 / num

System.out.printf("The percentage f excellent student is : %.1f", + percentage);


}

}

[keang]

so i bet its full of mistakes.

So have you tried compiling it to see what compile time mistakes you have?

[ello1]

should i copy paste em here?

[ello1]

yup i can fix em... because there are so many dont know where to start from

[ello1]

i can't fix them*

[keang]

Only if you can't fix them yourself

[ello1]

i used netbeans to compile it.... and this is all the errors it shows.

ant -f "C:\\Users\\Al Doctor\\Documents\\NetBeansProjects\\HafsaShahab_112532" clean jar
init:
deps-clean:
Updating property file: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\built-clean.properties
Deleting directory C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build
clean:
init:
deps-jar:
Created dir: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build
Updating property file: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\built-jar.properties
Created dir: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\classes
Created dir: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\empty
Created dir: C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\generated-sources\ap-source-output
Compiling 7 source files to C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\build\classes
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:23: error: <identifier> expected
studentarray = new.int[num];
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:23: error: <identifier> expected
studentarray = new.int[num];
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:24: error: ';' expected
{for (i = 0; i < studentarray.lenght, i++ )
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:24: error: ')' expected
{for (i = 0; i < studentarray.lenght, i++ )
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:24: error: illegal start of expression
{for (i = 0; i < studentarray.lenght, i++ )
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:25: error: ';' expected
sum = sum + arr[num]
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:30: error: ';' expected
percentage = count * 100 / num
7 errors
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\nbproject\build-impl.xml:915: The following error occurred while executing this line:
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\nbproject\build-impl.xml:268: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)

[keang]

Read the error messages carefully they tell the line number the problem is on (and show you the line) and tell you what is wrong. For instance:

C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:25: error: ';' expected
sum = sum + arr[num]
C:\Users\Al Doctor\Documents\NetBeansProjects\HafsaShahab_112532\src\Q7_A_112532.java:30: error: ';' expected
percentage = count * 100 / num

Look at these two lines and the error message which says ';' is expected. What do statements in Java have to end with?

[ello1]

okay i get that part... but now its not even running.... it says that it doesn't have a main method. Could you do me the biggest favor and go through the code once... and tell me if u think what i am trying to do is right or not.... you see the thing is i srudy in an arab country where majority of my class speaks Arabic... so our professor is compelled to speak Arabic most of the time... and that is how i miss those small points that make these programs work.

[keang]

okay i get that part... but now its not even running

It can't have been running before, it wouldn't compile.
Post your latest code with all these fixes in place - please use code tags when posting code.

Your code is on the right lines - you are missing the bit where you ask the user of each of the scores but the rest looks basically correct.
What are grade and gradeCount for - they are not part of the question you posted.

[ello1]

um i thought u would need to calculate the percentage of excellent students... thats why... u think i should remove that part?

[ello1]

okY so i got the errors down to 5.. here the new code so far... i forgot to give a option for the user to enter grade..

import java.util.Scanner;
public class Q7_A_112532 {
public static void main(System[] args){
Scanner input = new Scanner(System.in);
int num = 0;
int excellentstudent;
excellentstudent = 0;
double percentage = 0;
int grade;

System.out.print("enter the total number of students: ");
num = input.nextInt();
int i;
int studentarray;
studentarray = new.int[num];
{for (i = 0; i < studentarray.length, i++ )};
sum = sum + arr[num];

System.out.print("Enter the grade of the student: ");
grade = input.nextInt();

if (grade >= 90 )
gradecount ++;

percentage = count * 100 / num;

System.out.printf("The percentage f excellent student is : %.1f", + percentage);


}

}

[keang]

um i thought u would need to calculate the percentage of excellent students... thats why... u think i should remove that part?

But you aren't using it anywhere. But I wouldn't worry about that at the moment, the first thing is to get your code compiling.