Java program Grade

[Fatfat Tika]

create a program that accepts grade in prelim,midterm,semi and finals
then compute the overall grade by getting the 20% of prelim, midterm, semi then 40% of finals then displays the rating
grade rating
97-100 1.00
94-98 1.25
91-93 1.5
88-90 1.75
85-87 2.00
82-84 2.25
80-81 2.5
76-79 2.75
75 3.0
70-74 5.0

is there anyone who can help me here?
I really need it
I'm just new in programming java.

[Mohamed Sanaulla]

Please DoYourOwnHomework, ShowSomeEffort.
If you are new to Java, we would suggest you learn the syntax and try out few programs.

[Thakur Sachin Singh]

hai brother if you are new in java..so try to learn java and solve this question itself...this is the good way of lerning otherwise you lose programming skills.

[Fatfat Tika]

should I use If then?

[Thakur Sachin Singh]

why not...practice more & more...this is the best way of learning.

[Fatfat Tika]

hey!, what should I do in computing the grades using IF THEN? I'm experiencing errors

[Thakur Sachin Singh]

char ch;

if(percent>60)
ch='A';
else if(percent>45)
ch='B';
else if(percent>35)
ch='C';
else
ch='F';

you want this solution.
what you want to say...say clear..

[Fatfat Tika]

import javax.swing.*;
class CaseGrade{
public static void main(String args[]){

int prelim= Integer.parseInt(JOptionPane.showInputDialog("prelim"));
int midterm= Integer.parseInt(JOptionPane.showInputDialog("midterm"));
int semi= Integer.parseInt(JOptionPane.showInputDialog("semi"));
int finals= Integer.parseInt(JOptionPane.showInputDialog("finals"));

that's the first part, what should I do next? uhmm! what do you think?

[Thakur Sachin Singh]

there is two way--

first you add all integers part perform operation on it like
[deleted]

char ch;

if [deleted]

[Thakur Sachin Singh]

and the other way is to find out percent seperately...this is depend on your requirement.

[Campbell Ritchie]

Come on, people. That is hardly a way to welcome a newcomer

Welcome to JavaRanch

You will have to work out how to add marks with the 20% and 40% formula. Do that on paper, before you try writing any code. The write down, again with paper and pencil something like this:

If he gets less than -97% call it a grade 97½

Otherwise: If he gets less than -102% call it a grade 99

Otherwise, if he gets less than -55% call it a grade 52½

Take a pencil and follow the flow of execution through those options for marks like -44%, -99% and -150%. That should allow you to get the if bits in the right order.

Only after you have done that should you even think or writing any code. And don't just say you "get errors"; that is totally useless for getting any help. You must tell us what errors you are suffering.

[Campbell Ritchie]

Thakur Sachin Singh wrote:char ch;

if(percent>60)
ch='A';
else if(percent>45)
ch='B';
else if(percent>35)
ch='C';
else
ch='F';

you want this solution.
what you want to say...say clear..

No, no, no. Don't go giving a solution like that. That doesn't help at all. Look at Beginning Java, where you read

We're all here to learn, so when responding to others, please focus on helping them discover their own solutions, instead of simply providing answers.

Unfortunately I didn't see your response in time to stop you doing any harm. You are depriving other people of the chance to learn by giving a simple answer like that.

[Fatfat Tika]

uhmm! I don't know how to do/combine the percentage,grade and rating.

[Campbell Ritchie]

I have already told you, work out the percentage first.
Again, don't try any code until you see on paper what you want.

[Thakur Sachin Singh]

ok campbell...next time i follow these things..thanks for telling me.

[Fatfat Tika]

yes I already did it before, but I'm having a hard time doing it in JAVA.

[Campbell Ritchie]

And what did you write on paper?

[Mohamed Sanaulla]

And you need not directly jump to a Application with GUI. Start out with taking input from console and the make the core of your code- which does the percentage calculation and grade assignment work. You can take the same code and use it for input from GUI.

[Fatfat Tika]

prelim,midterm,semi * .20 finals *.40

[Campbell Ritchie]

That is too basic. You have to read each number, multiply as appropriate, and add them. I suggest you divide by 5 when you have the total.
You are going to have to write a lot more.

[Fatfat Tika]

are you sure I should divide it by 5 not 4?

[Mohamed Sanaulla]

Fatfat Tika wrote:are you sure I should divide it by 5 not 4?

I think It should be 4.

[Campbell Ritchie]

5

[Campbell Ritchie]

Mark 1

Add Mark 2

Add Mark 3

Add 2 × Mark 4

Divide total by 5

[Fatfat Tika]

this actually my assignment
my sample output should be
prelim:90
midterm:93
semi:80
finals:85
overall:88.2
rating:

but I can't solve the overall..

[Campbell Ritchie]

That adds up to 86.6, not 88.2

[Fatfat Tika]

tnx what should I do next?

[Campbell Ritchie]

Fatfat Tika wrote: . . . but I can't solve the overall..

Don't even try to solve the whole exercise. Get it to print the overall average mark, and forget about the grades.

Add the grades later, once you have the averages working.

[Campbell Ritchie]

Fatfat Tika wrote:tnx what should I do next?

Show us how you are working out the average, on paper, and then show us (in a subsequent post) what it looks like in Java™.

You already seem to have the reading from the keyboard working.
Have you been told to use JOptionPane, rather than Scanner; JOptionPane is considered very old-fashioned coding now?

[Fatfat Tika]

prelim:90
midterm:93
semi:80
finals:85

90*.20=18
93*.20=18.6
80*.20=16
85*.40=34
_________
86.6

I'm not sure what to write in Java
but I'm thinking of If & Then...

[Campbell Ritchie]

You can't do it quite like that if using ints. Add or multiply first, and divide (by 5 ) later. That technique will work nicely if you are using doubles, however.

[Fatfat Tika]

90+93+80*.20=52.6
85*.40=34
_________
86.6

like this??

[Campbell Ritchie]

Fatfat Tika wrote:prelim:90
midterm:93
semi:80
finals:85

90*.20=18
93*.20=18.6
80*.20=16
85*.40=34
_________
86.6

That will give the correct answer, but all those values will be doubles. Probably easiest at this stage to use that formula, remembering to declare your average as a double.

I'm not sure what to write in Java
but I'm thinking of If & Then...

Forget about if and then until you have the averages working. One little bit at a time.

[Campbell Ritchie]

Fatfat Tika wrote:90+93+80*.20=52.6
85*.40=34
_________
86.6

like this??

but (90 + 93 + 80) × 0.20 + 85 × 0.40 would be better still, I think. Remember the (). Remember that returns its result as a double.
(90 + 93 + 80 + 2 * 85) ÷ 5.0 will give the same result, 86.6.

Remember the () are necessary. Remember × and ÷ are not used in the actual code.

[Campbell Ritchie]

I earlier wrote:. . . (90 + 93 + 80 + 2 * 85) ÷ 5.0 . . .

(90 + 93 + 80 + 2 * 85) ÷ 5, however is an int, and will give the result 86. That is still correct under the rules of integer arithmetic.

[Fatfat Tika]

how about the ratings?

[Campbell Ritchie]

Show us the Java™ for calculating the overall grade, then worry about the 1 1¼, etc. later.

[Fatfat Tika]

double overall=(prelim+midterm+semi+2*finals)/5.0;

[Campbell Ritchie]

Looks good. Improve your style by changing it to this

double overall = (prelim + midterm + semi + 2 * finals) / 5.0;
System.out.prinlnt(overall);

Then you can see it working. You can remove the print instruction later. The only change is that I have added spaces, which improve readability.

I have got to go now, but you have an application which will run and print the overall mark. Half of it done

[Fatfat Tika]

aww! thanks, I learn a lot thank you for the time and effort