9 replies to this topic

[Ebda3]

hi everybody
kindly Who can solve these programs in Java?? :crying::crying:

1-Write a java program that reads and calculates the sum of integer numbers(using while loop)(JOptionPane(input).
Note :the input (-1) signifies the end of the input.

2-Write a program that reads an unspecified number of integers, determines how many positive and negative values have been read, and computer the total and average of the input values, not counting zeros. Your program ends with the input 0. Display the average as a floating-point number.(For example, if you entered 1,2 and 0 , the average should be 1.5) (JOptionPane or Scanner(input))


3-(Conversion from miles to kilometers) write a program that displays the following table (note that 1 mile is 1.609 kilometers)(JOptionPane or Scanner(input):

Miles......Kilometers
1...........1.609
2........... 3.218
.
.
.
9............14.481
10..........16.09




Please Please help meeeee:crying:

Edited by Ebda3, 13 April 2011 - 09:57 PM.

[WingedPanther]

Moved to the correct forum (you did not post a tutorial).

What do you have so far?

[Ebda3]

I am sorry to put it in the wrong forum Pro...

actually these 3 programs that u read it how we can resole it ?

Thanx for your interesting

[gregwarner]

We can help you figure out how to do it if you give us what you have written so far and let us know where you are having trouble with it.

[mr mike]

Just follow this psuedocode, it will help you. I only gave the psuedocode for one and two because
three follows the similar pattern of 1 and 2.

PROGRAM 1:

   begin program


      declare a sum x


      while input != -1


         ask user for y

         store input in y

         x += y


      end while


      display x 

   END


PROGRAM 2:

   BEGIN program

      declare a average x

      declare a sum y

      declare a counter i

   

      while input != 0


         ask user for z

         store input in z

         y += z


         ++i


      end while


      x = y / i

      display x


   END 

[Ebda3]

Thank you all for your cooperation

Dear gregwarner
:love:

Dear mr mike, :thumbup:

how do you see this figure for a program 1??

Quote

import javax.swing.*;
public class S1
{
public static void main(String args[])
{

int x=Integer.parseInt(JOptionPane.showInputDialog("Please enter num1 :"));

while(x!= -1)
{
int y=Integer.parseInt(JOptionPane.showInputDialog("Please enter num2 :"));

x+=y;
System.out.println(x);
}

}
}

Program 2

import javax.swing.*;
public class S2
{
public static void main(String args[])
{

int x;
int y;
int i;

int input=Integer.parseInt(JOptionPane.showInputDialog("Please enter num :"));

while(input!= 0)
{
int z=Integer.parseInt(JOptionPane.showInputDialog("Please enter num2 :"));

y+=z;
++i;

}

System.out.println("x ="+(y/i));

}
}

:crying:

about program 3 it doesn't clear to me

and I am grateful and appreciate your effort
:)

[wim DC]

Close, but in both program 1 and 2, you use 2 variables for input.
x and y in program 1. input and z in program 2.

And try to give your variables meaningful names like "input" in program 2. That means something, instead of x, y, .. (It's ok for loop counters)

You want 1 variable to be the input, 1 to be the sum/total. Like for 1:

int input=Integer.parseInt(JOptionPane.showInputDialog("Pl ease enter num1 :"));

int sum = 0;


while(input!= -1)

{

    sum  += input;

    input=Integer.parseInt(JOptionPane.showInputDialog("Pl ease enter num2 :"));

}

System.out.println("total: " + sum);

And 2: (note this won't compile due to the "???" for average and the if-statement.)

int average;

int total;

int positiveCount;

int i;


int input=Integer.parseInt(JOptionPane.showInputDialog ("Please enter num :"));


while(input!= 0)

{

    if(???) {

        positiveCount++;

    }

    total += input;

    input = Integer.parseInt(JOptionPane.showInputDialog("Pl ease enter num2 :"));

    ++i;

    average = ???;

    

}


System.out.println("Total: " + total);

System.out.println("Average: " + average);

System.out.println("Number of positives: " + positiveCount + ", number of negatives: " + (i-positiveCount) );

I find program 3 the easiest of them all. I recommend a for-loop. Then just loop from 1 to 10, and do 1.609 * loopNumber and print it.
Example for loop, loops 50 times:

for([B][COLOR="lime"]int i=0[/COLOR][/B] ;[B][COLOR="orange"] i<50[/COLOR][/B] ; [B][COLOR="red"]i++[/COLOR][/B]){

   System.out.println( i );

}

The green part gets executed 1 time, before starting the loop.
The orange part is executed every loop, before actually doing the loop.
The red part is executed at the end of every loop.

If written with a while loop, it would look like:

[B][COLOR="lime"]int i=0;[/COLOR][/B]

while( [B][COLOR="orange"]i<50[/COLOR][/B] ){

   System.out.println( i );

   [B][COLOR="red"]i++;[/COLOR][/B]

}

As you see, it's just an easier and prettier way of writing a loop.

[Ebda3]

Dear wim DC
actually i get the program1

Quote

import javax.swing.*;
public class S1
{
public static void main(String args[])
{

int input=Integer.parseInt(JOptionPane.showInputDialog("Pl ease enter num1 :"));
int sum = +1;


while(input!= -1)
{
input=Integer.parseInt(JOptionPane.showInputDialog("Pl ease enter num2 :"));

sum += input;

}
System.out.println("total: " + sum);

}
}

still 2 nd 3 im trying

[Ebda3]

Program 3

Quote

import javax.swing.*;
public class S2
{
public static void main(String args[])
{
System.out.print("Mile ");
System.out.println("\t\tKiloMeters ");

int input=Integer.parseInt(JOptionPane.showInputDialog ("Please enter num :"));
for(int i=1 ; i<=10 ; i++){

System.out.println( i );

}

The output doesn't look what i want

still the Kilometer how i can put it in the table

[Ebda3]

I think this is the solution what should be like in Program 3

Quote

import javax.swing.*;
public class S2
{
public static void main(String args[])
{
System.out.print("Mile ");
System.out.println("\t\tKiloMeters ");

int input=Integer.parseInt(JOptionPane.showInputDialog ("Please enter num :"));
for(int i=1 ; i<=10;i++){

System.out.print(i);
System.out.println("\t\t "+i*1.609);

}
}
}

remaing Program 2
:confused:

who can explain it more :)