Question

What is the output for code A and B?:


*Code A: var x = 10; y = --x + 1; alert(y);

*Code B: var x = 10; y = x-- + 1; alert(y);


a) 11, 10 b) 10, 10

C) 10, 11 d) 11, 11

Answer 1

If these are two different conditions then the answer will be:
C)10, 11

Answer 2

The output of A and B are option (c)10,11

Explanation:

1. $"--"$ before the variable is used to decrease variable value by  one before putting the value in the variable.
2. $"--"$ after the variable is used to decrease variable value by one after putting the value in the variable.
3. here, in A $"--"$  is used before the variable that's why the value of x is decreased by one before it is added to one in  $y= --x+1$        
4. here, in B $"--"$ is used after the variable  that's why the value of x is decreased by one after it is added to one in $y= x-- +1$
5. hence, value of y in A is $10$ and in B is $11$