Question

Guess the output
public class Increment Decrement
Quiz
{
public static void main(String[] args)
{
int a=11, b=22, C;
C = a + b + a-- + + + + + + a + ++b:
System.out.println("a="+a);
System.out.println("b="+b);
System.out.println("c="+c);
}
}​

Answer 1

Answer:

a=11

b=23

C=78

Explanation:

Your question has extra '+' before the third appearance of 'a'. If we consider 3 '+' only, the value of C comes out to be 78.

Answer 2

Answer:

The output after running this code is that $a$ is $13,b$ is $24$ and $c$ is $103.$

Explanation:

Increment and decrement operators in Java also are referred to as unary operators because they treat one operand. The increment operator (++) adds 1 to its operand and therefore the decrement operator (–) subtracts one.

Given $a=11,b=22$.

It is also only if $c=a+b+a+++b+++++a+++b$.

Now, we'll substitute the values within the above expression, we get

$c=11+22+(a$ is used before the increment$)+(b$ is used before the increment$)+(a$ is used after increment$)+(b$is used after decrement$).$

$a$ is used before increment means one is added to $a$, i.e.

$a=a+1\\a=11+1\\a=12$

$b$  is used before increment means one is added to $b$, we get

$b=b+1\\b=22+1\\b=23$

$a$ is used after increment means one is added to $a$, i.e.

$a=a+1+1\\a=11+2\\a=13$

$b$  is used after increment means one is added to $b$, we get

$b=b+1+1\\b=22+2\\b=24$

Then we get

$c=11+22+11(a=12,b=22)+22(a=11,b=23)+13(a=13,b=23)+24(a=13,b=24)\\c=11+22+11+22+13+24\\c=103$

and $a=13,b=24$  

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