Question:

Consider the following code segment:

int a = 10;
int b = 5;
int c = 2;

int result = a++ - (b++ * --c);

What is the final value of result after executing the code segment? Show your step-by-step calculations to support your answer.

Answer:

The final value of result after executing the code segment is 3. Let's go through the step-by-step calculations to understand how this result is obtained:

1. Initialize variables:

   • a is assigned a value of 10.
   • b is assigned a value of 5.
   • c is assigned a value of 2.

2. Evaluate the expression a++ - (b++ * --c):

   • The a++ expression is a post-increment operation, so the current value of a (which is 10) is used in the expression, and then a is incremented by 1. Therefore, the value of this expression is 10.
   • The b++ expression is also a post-increment operation, so the current value of b (which is 5) is used in the expression, and then b is incremented by 1. Therefore, the value of this expression is 5.
   • The --c expression is a pre-decrement operation, so c is decremented by 1, and then the current value of c (which is 1) is used in the expression. Therefore, the value of this expression is 1.
   • Now, evaluate the expression b++ * --c:
     • The b++ expression has already been evaluated, and its value is 5.
     • The --c expression has also been evaluated, and its value is 1.
     • Multiply the values 5 * 1, resulting in 5.
   • Finally, evaluate the expression a++ - (b++ * --c) as 10 - 5, resulting in 5.

3. Assign the value 5 to result.

Therefore, the final value of result is 5.

Please note that the operators ++ and -- have different meanings depending on whether they are used as post-increment/post-decrement or pre-increment/pre-decrement. Post-increment increases the value after using it in the expression, while pre-increment increases the value before using it in the expression. Post-decrement and pre-decrement work in a similar manner, but decrease the value instead.