Thread: [Help] Java Project: Electricity Bill

how to let java take a rate between 1-1000 and 1001-2000 and so on ..

Use an if statement with the condition specifying the range of values. Something like:
if(x > 3 && x < 10) { ...

Your chained if /else if statements should also work.

Print out the value of the rate after the if tests to see if it has the correct value.

Originally Posted by Norm

Use an if statement with the condition specifying the range of values. Something like:
if(x > 3 && x < 10) { ...

Your chained if /else if statements should also work.

Print out the value of the rate after the if tests to see if it has the correct value.

thanks man ,,
and the other thing
as u can see in the attached file there is a table on how kwh consumption is calculated,,
for each service there is a consumption rate
for example at 4001-5000 kwh the consumption rate for Residential is 12 but for Commercial is 20..
so it's up to the user to choose Residential or Commercial
how can i let java take rates of each based on user choice

how can i let java take rates of each based on user choice

I don't know how your program determines what the user has chosen.
You will need to get and save that information so you can use it later to determine what equation to use to compute the bill.

Originally Posted by Norm

I don't know how your program determines what the user has chosen.
You will need to get and save that information so you can use it later to determine what equation to use to compute the bill.

i know how to compute the bill but i don't know how to let java take ( Residential Rates or Commercial Rates ) i don't know how to save it as a statement in java

how to save it as a statement in java

Define a variable and assign it the value:
final int ResRate = 123.4;
final int ComRate = 234.5;

Then use the variable in the formula to compute the bill.

Originally Posted by Norm

Define a variable and assign it the value:
final int ResRate = 123.4;
final int ComRate = 234.5;

Then use the variable in the formula to compute the bill.

it doesn't have a final rate ,,
check the file i attached to get the point

What does the variable: Service contain?

check the attached file project_one.doc in first post and see the table

Can you copy the relevant parts into your program so it can be seen as part of your posting on this thread?

i will get u to the point,,
if the user put the service on Residential
this will be the Rates:

PHP Code:

if (Total >= 1 && Total <=1000)
    RatePerUnit=5;
    else if (Total >= 1001 && Total <=2000)
    RatePerUnit=5;
    else if (Total >= 2001 && Total <=3000)
    RatePerUnit=10;
    else if (Total >= 3001 && Total <=4000)
    RatePerUnit=10;
    else if (Total >= 4001 && Total <=5000)
    RatePerUnit=12;
    else if (Total >= 5001 && Total <=6000)
    RatePerUnit=12;
    else if (Total >= 6001 && Total <=7000)
    RatePerUnit=15;
    else if (Total >= 7001 && Total <=8000)
    RatePerUnit=20;
    else if (Total >= 8001 && Total <=9000)
    RatePerUnit=22;
    else if (Total >= 9001 && Total <=10000)
    RatePerUnit=24;
    else if (Total > 10000)
    RatePerUnit=26; 


The RatePerUnit is changed when the user choose Commercial so the value can't be permanent ,
for example;
if (Total >= 1 && Total <=1000)
RatePerUnit=5 for Residential
but for Commercial:
if (Total >= 1 && Total <=1000)
RatePerUnit=12;

If you have two sets of rates then you need logic for each rate. You have posted the logic for the Residential.
Now you need logic for the Commerical.

If the two rate schedules have the same ranges of KWHs used, you might be able to use an array to get the rates from vs hardcoding them in the logic as you have done above. Use logic similar to what you have above to find what range of KWHs were used and save that info as an index into an array. Have two arrays: one for Residential and one for Commerical. Use the index to get the rate from the array.

Originally Posted by Norm

If you have two sets of rates then you need logic for each rate. You have posted the logic for the Residential.
Now you need logic for the Commerical.

If the two rate schedules have the same ranges of KWHs used, you might be able to use an array to get the rates from vs hardcoding them in the logic as you have done above. Use logic similar to what you have above to find what range of KWHs were used and save that info as an index into an array. Have two arrays: one for Residential and one for Commerical. Use the index to get the rate from the array.

i don't know to do arrays we didn't take these yet, is there an another way to do it ?
i have finished the logic for the 7 sets i have in the table but i don't know how to switch between them based on the user choice

how to switch between them based on the user choice

Use an if statement.

Originally Posted by Norm

Use an if statement.

1. for Residential, 2. for Commercial, 3. for Governmental, 4. for Agricultural, 5. for Charities, 6. for Private educational establishments, 7. for Private health establishments,

if (Service==1)
then i put the rates ?
can u show me the way ?

You need to repeat the code you posted in #11 above for the Commerical.
pseudo code:
if (residential) {
code from post #11
}else if (commerical){
code from post #11 modified for Commerical
}else if(government) {
... more of the same
} .... more of the same

As you can see this will be a lot of repeated code. This a natural place to use arrays. But you say that will come later in your lessons.

What techniques has your teacher given you that you can use here?