vb.net and c# issue in for loop

  • Thread starter Thread starter Benjamin Fallar III
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Benjamin Fallar III

hi,

i have some weird result using for loop...

here it is in vb.net.........

Module Module1

Sub Main()

For i As Integer = 1 To 3
Dim total As Integer
total += i
Console.WriteLine(total)
Next

End Sub

End Module

here it is in c#

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
for (int i = 1; i <= 3; i++)
{
int total = 0;
total += i;
Console.WriteLine(total);
}
}
}

the results are different...

i think because in c#, we cannot use the variable total if uninitialized...
how to go about this?
 
Benjamin Fallar III said:
hi,

i have some weird result using for loop...

here it is in vb.net.........

Module Module1

Sub Main()

For i As Integer = 1 To 3
Dim total As Integer
total += i
Console.WriteLine(total)
Next

End Sub

End Module

here it is in c#

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
for (int i = 1; i <= 3; i++)
{
int total = 0;
total += i;
Console.WriteLine(total);
}
}
}

the results are different...

i think because in c#, we cannot use the variable total if
uninitialized... how to go about this?
Click to expand...

In both cases, your accumulator should be declared and initialized once
*before the loop begins*. In the C# example it is reinitialized to zero on
each iteration.
 
hi,

i have some weird result using for loop...

here it is in vb.net.........

Module Module1

Sub Main()

For i As Integer = 1 To 3
Dim total As Integer
total += i
Console.WriteLine(total)
Next

End Sub

End Module

here it is in c#

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
for (int i = 1; i <= 3; i++)
{
int total = 0;
total += i;
Console.WriteLine(total);
}
}
}

the results are different...

i think because in c#, we cannot use the variable total if uninitialized...
how to go about this?
Click to expand...

In VB the DIM statement is scoped to the entire method. It is the
same as if you said:

Sub Main()
Dim total As Integer

For i As Integer = 1 To 3
total += i
Console.WriteLine(total)
Next

End Sub

In VB it is not possible to have block-scoped variables.

In the C# example, 'total' exists only inside the for loop. The
variable 'total' is reinitialized each time through the loop. If you
want the C# code to work like the VB code, move the definition of
'total' outside the for loop.
 
thanks jack! that confirms my code :)

Jack Jackson said:
hi,

i have some weird result using for loop...

here it is in vb.net.........

Module Module1

Sub Main()

For i As Integer = 1 To 3
Dim total As Integer
total += i
Console.WriteLine(total)
Next

End Sub

End Module

here it is in c#

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
for (int i = 1; i <= 3; i++)
{
int total = 0;
total += i;
Console.WriteLine(total);
}
}
}

the results are different...

i think because in c#, we cannot use the variable total if
uninitialized...
how to go about this?
Click to expand...

In VB the DIM statement is scoped to the entire method. It is the
same as if you said:

Sub Main()
Dim total As Integer

For i As Integer = 1 To 3
total += i
Console.WriteLine(total)
Next

End Sub

In VB it is not possible to have block-scoped variables.

In the C# example, 'total' exists only inside the for loop. The
variable 'total' is reinitialized each time through the loop. If you
want the C# code to work like the VB code, move the definition of
'total' outside the for loop.
Click to expand...
 
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