how can i improve this program....thank you

[monkey1001]

the program is supposed to calculate home or commercial gas usage and then print the type of customer,presen t reading,previou s reading,cubic used and cost for the month..the user inputs values btw 0-9999 and to determine number of cubic used subtract the previous from present.if present is less then previous subtract previous reading form 9999
add the current reading to that difference ot get cubic used
my trouble is the calculation i think if nothing else....

import java.util.Scann er;

public class NameGasUtilityC ompany
{
public static void main(String [] args)
{
char choice;
int value,present,p revious,cubic;
char home,commercial ,name,usage;
double cost;

Scanner keyboard= new Scanner(System. in);
System.out.prin tln("Welcome to Name Gas");
name=keyboard.c harAt(0);
System.out.prin tln("What type of customer are you? 'H' or 'h'(home)|| 'C' or 'c' (commercial)");
choice=keyboard .charAt(0);
System.out.prin tln("Enter only cubic value in the range 0-9999");
value=keyboard. nextInt();

(usage = previous-present);
if(present < previous)
{ usage = (previous - 9999)* present;
(usage=present + usage);
else
usage = previous-present;
}
if (choice == 'H' || choice == 'h')
{
// use this formula constant
{if (cubic == 70)
cost = 5.00;
else if (cubic <= 100)
cost = cubic * .05;
else if (cubic <= 400)
cost = cubic * .025;
else
cost = cubic * .015;
}

if (choice == 'C' || choice == 'c')
{
//use this formula or constant
{if (cubic == 200)
cost = 30.00;
else if (cubic <=500)
cost = cubic * .04;
else if (cubic > 700)
cost = cubic * .03;
}

System.out.prin tln("Present meter reading" + present);
System.out.prin tln("Previous meter reading" + previous);
System.out.prin tln("Enter how many cubic used :" + usage);
System.out.prin tln("Cost this month $: " + cost);

}
}
}
}

[sukatoa]

the program is supposed to calculate home or commercial gas usage and then print the type of customer,presen t reading,previou s reading,cubic used and cost for the month..the user inputs values btw 0-9999 and to determine number of cubic used subtract the previous from present.if present is less then previous subtract previous reading form 9999
add the current reading to that difference ot get cubic used
my trouble is the calculation i think if nothing else....

You forgot to post your code in code tags... ;-)

About your trouble, it may takes time to analyze your code if you don't show us your formula...

Please give us sample on a specific input with expected output...

example:

if this is my input, then this should be the output...


Don't forget to test your code in the worst case...


Sukatoa.

[monkey1001]

the program is supposed to calculate home or commercial gas usage and then print the type of customer,presen t reading,previou s reading,cubic used and cost for the month..the user inputs values btw 0-9999 and to determine number of cubic used subtract the previous from present.if present is less then previous subtract previous reading form 9999
add the current reading to that difference ot get cubic used
my trouble is the calculation i think if nothing else....

the input is to determine the type of customer using the value btw 0-9999 and prompt user for the present and previous reading. the output is to print something that looks like a bill including header,customer type,presenet and previous reading,number cubic used and amount due..

[sukatoa]

the input is to determine the type of customer using the value btw 0-9999 and prompt user for the present and previous reading. the output is to print something that looks like a bill including header,customer type,presenet and previous reading,number cubic used and amount due..

at line 20, why you inclose the statement in a parenthesis?

Please check if the braces are inclosed...

Your keyboard object is not a String object, it is a Scanner...Pleas e read about String.

Also your choice object... it is a character... an attempt to extract the character into a character is not-allowed...

Trying to store integer type values in character type variable is not allowed...



Maybe your trouble is how to fix this code.... ;-)

If you just read the book and have an experiment of it,
Im sure you won't ask this kind of question...