Chapter 6 Page 140

Frodo · January 3rd, 2012, 03:55 PM

Intellisense tells me that the int i; outside the loop should not be there:

Quote:

Error 1 A local variable named 'i' cannot be declared in this scope because it would give a different meaning to 'i', which is already used in a 'parent or current' scope to denote something else C:\BegVCSharp\Chapter6\CH06Ex01\page140\Program.cs 14 22 page140

Is the int i; a typo?

Imar · January 4th, 2012, 10:05 AM

Hi there,

Can you post your code (I don't have the book). And is this your own code, or code directly taken from the book?

Imar

Frodo · January 4th, 2012, 10:29 AM

Quote:

Originally Posted by Imar

Hi there,

Can you post your code (I don't have the book). And is this your own code, or code directly taken from the book?

Imar

Straight out of the book.

int i;
for (i=0, i<10....

Imar · January 4th, 2012, 12:07 PM

As I said, i don't have the book so I can't check how it's supposed to look.

What you just posted should compile fine, so maybe somewhere else you already defined another i variable? Can you post the full code for the class that contains this loop?

Cheers,

Imar

Frodo · January 4th, 2012, 08:05 PM

Code:

int i;
string text = "";
for(i=0;i<10,i++)
{
text="Line "+Convert.ToString(i);
Console.WriteLine("{0}",text);
}
Console.WriteLine("Last text output in loop:{0}",text);

This is on page 141 of the book. Isn't i being defined twice?

ChristianNagel · January 4th, 2012, 08:21 PM

Quote:

Originally Posted by Frodo

Code:

int i;
string text = "";
for(i=0;i<10,i++)
{
text="Line "+Convert.ToString(i);
Console.WriteLine("{0}",text);
}
Console.WriteLine("Last text output in loop:{0}",text);

This is on page 141 of the book. Isn't i being defined twice?

The code you've posted compiles fine with me if you change the "," in the for statment to ";" as it is in the book. The variable i is declared only once. Probably your code that doesn't compile uses something like this:

Code:

int i;
for (int i = 0; i < 10; i++)

which would create an error you described in the first post as here the variable i is declared a second time within the for statement.

Frodo · January 9th, 2012, 10:46 AM

Sorry it's taken me this long to get back to you. Thank you for your responses. I checked my code: I did have a semicolon where you identified the comma in the code that I thought I copied here. I apologize for the typo. This is what I now copy from my file and I get the error I cited below:

Quote:

namespace page140
{
class Program
{
static void Main(string[] args)
{
int i;
string text="";
for (int i = 0; i < 10; i++)
{
text = "Line " + Convert.ToString(i);
Console.WriteLine("{0}",text);
}
Console.WriteLine("Last text output in loop: {0}", text);
}
}

}

Imar · January 9th, 2012, 10:58 AM

As suggested earlier, you define i in the loop as well using int.

This:

for (int i = 0; i < 10; i++)

should be

for (i = 0; i < 10; i++)

Alternatively, don't declare i outside the loop.

Hope this helps,

Imar

Frodo · January 9th, 2012, 11:03 AM

Quote:

Originally Posted by Imar

As suggested earlier, you define i in the loop as well using int.

This:

for (int i = 0; i < 10; i++)

should be

for (i = 0; i < 10; i++)

Alternatively, don't declare i outside the loop.

Hope this helps,

Imar

That's it. Thanks.