16 replies to this topic

[Tezelia]

I am a beginner who needs help with one part of my coursework

I basically have to create a histogram that displays marks in this form

0 - 29: ****
30 - 49: *****
50 - 69: **
70 - 100: *****

I have nearly done everything except don't know how to actually display the "asteriks" (*)

I know for a fact that I have to use for or while loops but don't know how to


I am using Java Net Beans and my questions are

1) What code would I need to display display the asteriks?
2) Where would I put it?

P.S I could have just used strings at the beginning but for this piece of assignment I am not allowed to...


Here is my code;




package javaapplication3;

import java.util.*;


public class Main {




public static void main(String[] args) {

Scanner input = new Scanner(System.in);


int inputnumber = 0;
int cat1 = 0;
int cat2 = 0;
int cat3 = 0;
int cat4 = 0;
int counter = 0;



while (inputnumber <= 100) {
System.out.println("Please Enter Mark:");
inputnumber = input.nextInt();


if (inputnumber < 29) {
cat1 = cat1 + 1;
counter = counter + 1;

}

if ((inputnumber > 29) && (inputnumber <= 39)) {
cat2 = cat2 + 1;
counter = counter + 1;

}

if ((inputnumber > 39) && (inputnumber <= 69)) {
cat3 = cat3 + 1;
counter = counter + 1;

}

if ((inputnumber > 69) && (inputnumber <= 100)) {
cat4 = cat4 + 1;
counter = counter + 1;

}

}


System.out.println("\n0-29: " + cat1 + "\n\n30-39: " + cat2 + "\n\n40-69: " + cat3 + "\n\n70-100: " + cat4);
System.out.println("\n" + counter + " " + "Students in total");

}

}

------------------------

Please help me ):

Kind Regards

[wim DC]

Just loop from 0 to cat1 / cat2 / cat3 / cat4, like you looped from 0 to 100 already.
With just 1 thing in the loop: System.out.print("*"); -- NOT println!

By the way, you're missing '=' at the first if-statement. number 29 matches not a single if.

[Tezelia]

Thanks for the reply and correction!!

I've done what you told em to do but it's still not printing?

Is this the right code to use

while (cat1 > 0){
cat1 ++;
System.out.print("*");

}

or

while (cat1 > 0){
System.out.print("*");

}

or do I need o use a for loop, or putting in the wrong values?

Do I repeat this for every cat? and at the bottom have one line for all of them?

Do I put this code within the while loop I already have or do I have place is right at the bottom after the 100 loop???

---------- Post added at 05:49 AM ---------- Previous post was at 05:46 AM ----------

sorry if its from o to cat is it something like this?

int br = 0;

while (br => cat1){
cat1 ++;
System.out.print("*");

}

[wim DC]

It should be after this loop:

while (inputnumber <= 100) {

...

}

//here

If your code would've ran, I expected it would run indefinitely :P
So I assume you placed it wrong (luckily^^)

You can choose between

while (cat1 > 0){

  cat1--;

  System.out.print("*");

}

Or

for(int i=0 ; i<cat1 ; i++){

   System.out.print("*");

}

---------- Post added at 03:51 PM ---------- Previous post was at 03:50 PM ----------

This would work as well:

int br = 0;


while (br < cat1){
    br ++;
System.out.print("*");
}

[Tezelia]

I placed it like this as you asked but it still doesn't work ):


while (inputnumber <= 100) {
System.out.println("Please Enter Mark:");
inputnumber = input.nextInt();
}

for(int i=0 ; i<cat1 ; i++){
System.out.print("*");
}

thanks so much for helping me

[wim DC]

Works fine for me.
You still need those if-statements in your while loop.

if (inputnumber < 29) {
cat1 = cat1 + 1;
counter = counter + 1;

}

if ((inputnumber > 29) && (inputnumber <= 39)) {
cat2 = cat2 + 1;
counter = counter + 1;

}

if ((inputnumber > 39) && (inputnumber <= 69)) {
cat3 = cat3 + 1;
counter = counter + 1;

}

if ((inputnumber > 69) && (inputnumber <= 100)) {
cat4 = cat4 + 1;
counter = counter + 1;

}

This works:

Scanner input = new Scanner(System.in);
        int inputnumber = 0, cat1 = 0, cat2 = 0, cat3 = 0, cat4 = 0;
        while (inputnumber <= 100)
        {
            System.out.println("Please Enter Mark:");
            inputnumber = input.nextInt();


            if (inputnumber < 29)
            {
                cat1 = cat1 + 1;
//                counter = counter + 1;

            }

            if ((inputnumber > 29) && (inputnumber <= 39))
            {
                cat2 = cat2 + 1;
//                counter = counter + 1;

            }

            if ((inputnumber > 39) && (inputnumber <= 69))
            {
                cat3 = cat3 + 1;
//                counter = counter + 1;

            }

            if ((inputnumber > 69) && (inputnumber <= 100))
            {
                cat4 = cat4 + 1;
//                counter = counter + 1;

            }
        }

        for (int i = 0; i < cat1; i++)
        {
            System.out.print("*");
        }
}

[Tezelia]

Ok thanks so much the concept does work but I have another problem, how do I actually print the asterisks * next to the range ;)

for example, the program should end like this

0 - 29 *****
30 - 59 ****
60 - 79 ***
80 - 100 ***

---------- Post added at 06:17 AM ---------- Previous post was at 06:14 AM ----------

so basically the numbers in cat1 would be replaced with the asteriks so if i get 4 numbers in the range between 0 - 29

it should be displayed as

0 - 29 ****

thanks ever so much

[wim DC]

Just print it before you do the asterisks :P

System.out.print("0-29");

for (int i = 0; i < cat1; i++) {

    System.out.print("*");

}

[Tezelia]

Hey I tried it, the concept works again thank you but it's literally printing it off like this

0-29*30-49*40-69*70-100
0-29: 1

30-39: 1

40-69: 1

70-100: 0

What am I doing wrong lol, here is my code:

if ((inputnumber > 69) && (inputnumber <= 100)) {
cat4 = cat4 + 1;
counter = counter + 1;

}

}

System.out.print("0-29");
for (int i = 0; i < cat1; i++)
{
System.out.print("*");
}


System.out.print("30-49");
for (int i = 0; i < cat2; i++)
{
System.out.print("*");
}


System.out.print("40-69");
for (int i = 0; i < cat3; i++)
{
System.out.print("*");
}


System.out.print("70-100");
for (int i = 0; i < cat4; i++)
{
System.out.print("*");
}


System.out.println("\n0-29: " + cat1 + "\n\n30-39: " + cat2 + "\n\n40-69: " + cat3 + "\n\n70-100: " + cat4);
System.out.println("\n" + counter + " " + "Student(s) in total");



}
}

[wim DC]

That's correct output apart from needing some enters, right?

for (int i = 0; i < cat2; i++)

{

System.out.print("*");

}

[B]System.out.println();[/B]

[Tezelia]

It's still printing it out like this;

0-29*30-49**40-6970-100*

When I basically need the ranges to be layed out vertically ;)

0 - 29 *
30 - 49 **
40 - 69
70 - 100*

Is it somethign to do with print and println, shall; i put println next to the ranges on the top, here is my current code wih the problem:


System.out.print("0-29");
for (int i = 0; i < cat1; i++)
{
System.out.print("*");
}


System.out.print("30-49");
for (int i = 0; i < cat2; i++)
{
System.out.print("*");
}
System.out.println();


System.out.print("40-69");
for (int i = 0; i < cat3; i++)
{
System.out.print("*");
}
System.out.println( );



System.out.print("70-100");
for (int i = 0; i < cat4; i++)
{
System.out.print("*");
}
System.out.println( );


System.out.println("\n0-29: " + cat1 + "\n\n30-39: " + cat2 + "\n\n40-69: " + cat3 + "\n\n70-100: " + cat4);
System.out.println("\n" + counter + " " + "Student(s) in total");

Thanks

[wim DC]

Apart from missing a println after the first loop that seems fine...
Maybe you didn't compile / save the new source properly? Because you should have 3 [Enter]s even with the missing one.
run this:

public static void main(String[] args)
    {
        System.out.print("0-29");
        for (int i = 0; i < 5; i++)
        {
            System.out.print("*");
        }
        System.out.println();

        System.out.print("30-49");
        for (int i = 0; i < 4; i++)
        {
            System.out.print("*");
        }
        System.out.println();


        System.out.print("40-69");
        for (int i = 0; i < 6; i++)
        {
            System.out.print("*");
        }
        System.out.println();


        System.out.print("70-100");
        for (int i = 0; i < 2; i++)
        {
            System.out.print("*");
        }
        System.out.println();
    }