CODEWITHSUNDEEP
vb.netoperators
HereToLearn_
HereToLearn_

Reputation: 1180

What does += mean in Visual Basic?

I tried to google the answer for this but could not find it. I am working on VB.Net. I would like to know what does the operator += mean in VB.Net ?

Upvotes: 4

Views: 16565

Answers (5)

Person
Person

Reputation: 1

Just makes code more efficient - 

Dim x as integer = 3

x += 1

'x = 4

is the same as

x = x + 1

'x = 4

It can also be used with a (-):

x -= 1

' x = 2

Is the same as

x = x - 1

'x = 2

Upvotes: 0

It'sNotALie.
It'sNotALie.

Reputation: 22814

It is plus equals. What it does is take the same variable, adds it with the right hand number (using the + operator), and then assigns it back to the variable. For example, 

Dim a As Integer
Dim x As Integer
x = 1
a = 1
x += 2
a = a + 2
if x = a then
MsgBox("This will print!")
endif

Upvotes: 2

sharp12345
sharp12345

Reputation: 4498

those 2 lines compiled produce the same IL code:

x += 1

and

x = x + 1

Upvotes: 1

Carlos Vergara
Carlos Vergara

Reputation: 3622

a += b

is equivalent to

a = a + b

In other words, it adds to the current value.

Upvotes: 5

Steven Doggart
Steven Doggart

Reputation: 43743

It means that you want to add the value to the existing value of the variable. So, for instance:

Dim x As Integer = 1
x += 2  ' x now equals 3

In other words, it would be the same as doing this:

Dim x As Integer = 1
x = x + 2  ' x now equals 3

For future reference, you can see the complete list of VB.NET operators on the MSDN.

Upvotes: 12

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