module, function

[mike221]

I want to do a module, a Function-type module.
I just want that module is right and then I may try
for example java, php, python - but that's not an issue now, I will see that later.

The module calculates the amount of the cash payment in connection with refundable sum of money.
And there must be a function, that will make a rounding with five penny accuracy.
function's call is f1 (y), where y is sum to be rounded off. A rounded off sum is obtained as a return value of the function.

This is very simple, I know, but I can't make this work, can you please help.
So this is how I have done it, but this isn't right.

MODULE ReturnMoney (y) (Items_sum, cash_payment)RETURNS money_back

money_back=f1 cash_payment - Items_sum ROUNDING??? HOW AND WHERE I PUT IT.....

ENDMODULE

[WingedPanther]

This is easy in any language, but you really need to pick a language first. Note that not all languages support the concept of modules/functions.

[mike221]

could someone please help? I will see a language later, first I need a help with a module and a function

[mike221]

I mean first in theory, in algorithm sense. but later for example python, java, php...

[WingedPanther]

You will probably need to multiply the value by 100, convert it to an integer, perform modulus division by 5, and then increase the original value by +2, +1, 0, -1, or -2 cents depending on that result.

[mike221]

thanks, But how I do that? I don't know how, I don't understand. And will I need another RETURN like this?;

MODULE ReturnMoney (y) (Items_sum, cash_payment)RETURNS money_back

RETURN money_back=f1 cash_payment - Items_sum

ENDMODULE

[WingedPanther]

It will depend on the language.

[mike221]

sorry. Well; python

[WingedPanther]

Moved to Python forum so those who know it's details can help.

[mike221]

Could someone help?, please.