Defining text and integer variables??

I found this in some code:
var num = 0, txt = "bo";
I guess it could also have been written as:
var num = 0,
txt = "bo";
Why is it allowed to define an integer by just using "," and when you define a text variable you use ";"

The code you are looking at would be javascript, not java.
Despite the name, the two are definitely NOT the same thing.
Why is it allowed to define an integer by just using "," and when you define a text
variable you use ";" You are misunderstanding the syntax.
The semicolon ';' completes a statement
the comma was just separating multiple variable declarations on the same line.
It could just as easily have been
var txt="bo", num=0;
var a=42, b=69, c=666;
Just to reiterate this is NOT valid java code. Java does not use the "var" keyword.
It is javascript, which means it can do pretty much whatever it likes ;-)

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