function fn1xyreturn ++x + y++fn145

The output would be 10.

Explanation:

• In the expression ++x, the variable x is incremented first and then used in the addition. So, x becomes 5 and the result of this expression is 5.
• In the expression y++, the variable y is used in the addition first and then incremented. So, y remains 5 and the result of this expression is also 5.
• Adding the results of the two expressions, we get 5 + 5 = 10.