Which of the following assignment statements are syntactically correct?

## PHP

 `i.   \$a = -10;` ` ii.  10 = \$b;` ` iii. \$a_b = \$a_b + 1;    ` ` iv.  \$a = "COWS";` `v.    \$a = COWS;` ` vi.   \$a + \$b = 40;    ` ` vii.  \$a = 3 \$b;    ` ` viii. \$a = "true";` `ix.  \$a = true;` ` x.   \$a %= 2;` ` xi.  \$a += 1;` ` xii. \$a =* 2;`

## Java, C++, C#

 `i.   a = -10;` ` ii.  10 = b;` ` iii. a_b = a_b + 1;    ` ` iv.  a = "COWS";` `v.    a = COWS;` ` vi.   a + b = 40;    ` ` vii.  a = 3 b;    ` ` viii. a = "true";` `ix.  a = true;` ` x.   a %= 2;` ` xi.  a += 1;` ` xii. a =* 2;`

## Visual Basic, Python

 `i.   a = -10` ` ii.  10 = b` ` iii. a_b = a_b + 1    ` ` iv.  a = "COWS"` `v.    a = COWS` ` vi.   a + b = 40    ` ` vii.  a = 3 b    ` ` viii. a = "true"` `ix.  a = true` ` x.   a -= b` ` xi.  a += 1` ` xii. a =* 2`
###### Solution

1. Correct. It assigns the integer value -10 to variable` a`.
2. Wrong. On the left side of the assignment operator, only one variable can exist.
3. Correct. It increases variable` a_b` by one.
4. Correct. It assigns the string (the text) COWS to variable` a`.
5. Correct. It assigns the content of constant COWS to variable` a`.
6. Wrong. On the left side of the assignment operator, only one variable can exist.
7. Wrong. It should have been written as` a = 3 * b `(as` \$a = 3 * \$b` in PHP).
8. Correct. It assigns the string true to variable` a`.
9. Correct. It assigns the value` true` to variable` a`.
10. Correct. This is equivalent to` a = a - b` (to` \$a = \$a - \$b` in PHP).
11. Correct. This is equivalent to` a = a + 1 `(to` \$a = \$a + 1` in PHP).
12. Wrong. It should have been written as` a *= 2` (as` \$a *= 2` in PHP)