What is nested if ?

Question

how can it work

Answer 1

if()
{ if()
{ if()
{ if()
{}
}
}
}
this is called nested if
i.e.,if within if condition

Answer 2

if inside if

Answer 3

it works by checking the condition of the first if, and if true enters the code block, which can have its own (nested) ifs inside, can go as deep as it needs to, 3-4 nested ifs are quite common, however try not to get too many levels deep with nested ifs, makes the code much harder to read