Question

Write the result stored in x after evaluating the following expression? [2]

int x = 4; x + = (x++) + (++x) + x;​

Answer 1

$\textsf{\large{\underline{Answer}:}}$

• The final value of x is - 20.

$\textsf{\large{\underline{Solution}:}}$

Given:

> x = 4

On evaluating the expression:

> x+= x++ + ++x + x

> x = x + x++ + ++x + x

> x = 4 + x++ + ++x + x  [Substitute the value]

> x = 4 + 4 + ++x + x  [x remains 4, post-increment]

> x = 8 + ++x + x  [x becomes 5]

> x = 8 + 6 + x   [x becomes 6, pre-increment]

> x = 14 + 6

> x = 20 (Answer)

⊕ So, the final value of x is 20.

$\texttt{\textsf{\large{\underline{Learn More}:}}}$

There are two types of increment/decrement operations.

1. Post increment/decrement.
2. Pre increment/decrement.

Post Increment/Decrement: Here, operation takes place first and then the value is incremented/decremented.

Example:

> int a = 2;

> int b = a++;

> b = 2

Now, a = 3.

Pre Increment/Decrement: Here, value is first increment/decrement and then the operation is carried out.

Example:

> int a = 2;

> int b = ++a;

> b = 3

Also, a = 3