What is nested if?

Question

Please give examples to understand.

Answer 1

a nested if is an if statement inside another if statement. For example

if(age>=18){
if(income>5000) /* this is a nested if because is
inside another if */
{
// some code
}
else. // this else statement is also nested
{
// some code
}
}

Answer 2

As bogdan said. Note that you should always place the curly braces because constructs like this are hazzarduous:

if ( boolean expression )
if ( boolean expression )
if ( ... )
else// caution: to which if does it belong?