Question

int k=5. j = 9; k+ = k++ - ++j + k++. sopln (j+k)​

Answer 1

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

Given:

→ k = 5

→ j = 19

> k += k++ - ++j + k++

> k = k + k++ - ++j + k++

> k = 5 + 5 - ++j + k++ (k remains same, post-increment)

> k = 10 - ++j + k++ (k becomes 6)

> k = 10 - 20 + k++ (j becomes 20, pre-increment)

> k = -10 + 6 (k remains same, post-increment)

> k = -4

Therefore:

→ k = -4

→ j = 20

Sum of k and j is printed.

> k + j = 20 - 4 = 16

∴ Output: 16

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

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