How to increase the scope in an if statement [modified]

[Nathan Revka]

I need to increase the scope of double fee and total. The following code doesn't work because fee and total are out of the scope on the writeline.

if (time <= 3)
{
fee = 2;
total = total + fee;
}

I have more if statements involving fee and total but they all will be applied to the following writeline

Console.WriteLine("Current charge: {0:c}, Total receipts: {1:c}", fee, total);

Edit: I made fee and total a static variable above the main method and now it works even though I set the new value of fee and total inside a block with less scope. I am not sure how this works, but it works, maybe someone can tell me why it works.

modified on Saturday, July 11, 2009 7:11 PM

[Lost User]

Nathan Revka wrote:

fee and total are out of the scope on the writeline.

They aren't, at least not in the code that you showed.

[Luc Pattyn]

Hi, I'm not sure what you are doing, but it could be very wrong.

public void someMethod1() {
if (time <= 3) {
int fee = 2;
}
Console.WriteLine("Fee: {0:c}", fee);
}

does not compile since fee does not exist outside the if block.

public void someMethod1() {
int fee = 0;
if (time <= 3) {
int fee = 2;
}
Console.WriteLine("Fee: {0:c}", fee);
}

does compile since fee exists outside the if block AND is guaranteed to hold a value.

int fee; // or static int fee;
public void someMethod1() {
fee=0;
if (time <= 3) {
fee = 2;
}
Console.WriteLine("Fee: {0:c}", fee);
}
public void someMethod2() {
fee=0;
if (time <= 2223) {
fee = 2222;
}
Console.WriteLine("Fee: {0:c}", fee);
}

is probably not OK since both methods share a variable they did not intend to share. Both methods could run at the same time (using threads) and confusing each other. If the data link between those methods is not intended, the methods really should use local variables. :)

Luc Pattyn [Forum Guidelines] [My Articles]

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[DaveyM69]

Nathan Revka wrote:

I made fee and total a static variable above the main method

Unless you have a particular need for a field to be accessible globaly and not tied to an instance, I would not have it as static. You mention your Main method, is this a console app? If so, create a seperate class and put stuff in that, and instanciate that class within the main method.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
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