can we have default statement in if and else ?

Answer 1

No
To use default is just for switch case statements as far as I know .

Answer 2

If you think about it, the "else" part of the statement is the default.

Answer 3

Oh yes I see

Answer 4

nope, we have if else if structure, in the end just use final else. serving as default mode

but I ve never tried to check it out, let's see if it works