Confusion

Question

What is the difference between if-else if and nested if-else can anybody?

Answer 1

Do you mean difference between:

if () {}
else if () {}

And:

if () {}
else {
if () {}
}

?

There is no practical difference.

You might know that if statements:
if () {statement;}

Can sometimes be written as:
if () statement;

Same works for else statements.
This:

if () {}
else {
if () {}
}

can be written as:

if () {}
else if () {}

And you can conclude that else if statements are actually else statements nested with if statement:
https://www.sololearn.com/discuss/1952469/?ref=app

Answer 2

Venky K Nannur

I will try to explain it with an example.

int age = 18;

if(age < 18){

//do someting

}

No else. Means if age >= 18 nothing will happens.

if(age < 18){

//do something

}else{

//do something

}

Here you handle the cases when age < 18 and if not it executes the else block.

if(age < 18){

if(age < 13){

//do something

}
}

This is an example of an nested if if statement. You can also add else cases for both.
It executes the code in the inner if statement only of age < 18 is true and age < 13 is true.

You can replace //do something with print statements to get more clarification.

Answer 3

Shortly this:

if (condition1) {statements1;}
else {
if (condition2) {statements2;}
}

Is always equivalent to this:

if (condition1) {statements1;}
else if (condition2) {statements2;}

But the second way is more readable.