Assume that total, num1, and num2 are int variables, with total = 2, num1 = 3, and num2 = 4. Show the new values of all variables changed by the following:

total = num2++;total = [Fill in the blank]
num2 = [Fill in the blank]

Question

Assume that total, num1, and num2 are int variables, with total = 2, num1 = 3, and num2 = 4. Show the new values of all variables changed by the following:
 
total = num2++;total = [Fill in the blank]
num2 = [Fill in the blank]

BlackTom AI · Accepted Answer

Post-increment operator num2++ yields the current value of num2 in the expression, then increments num2 by 1.

1) Relevant knowledge points and concepts
- The post-increment operator (written as variable++) returns the variable’s original value for use in the surrounding expression, and only after that evaluation does it increment the variable by 1.
- Assignment evaluates the right-hand side first, then stores that result into the left-hand side variable.
- Other variables not referenced by the statement remain unchanged.

2) Step-by-step reasoning
Initial values: total = 2, num1 = 3, num2 = 4.
Statement: total = num2++;

- Evaluate the right-hand side: num2++ is a post-increment. It yields the current value of num2, which is 4, for use in the assignment.
- Perform the assignment: total is set to the yielded value 4. So total becomes 4.
- Perform the increment side-effect: after yielding 4, num2 is incremented by 1, so num2 becomes 5.
- num1 is not involved, so it remains 3.

3) Intermediate steps shown
- Evaluate num2++ → yields 4 (current num2)
- Assign total = 4 → total changes from 2 to 4
- Then increment num2: num2 = 4 + 1 → num2 becomes 5

4) Why the correct answer is correct
Because post-increment semantics ensure the value used in the assignment is the original num2 (4), and the increment happens only after that evaluation, producing num2 = 5 afterward. Therefore total receives 4 and num2 ends as 5.

5) Why other possible answers are incorrect
A common incorrect thought is that total would become 5 and num2 stay 4 (that would be the behavior if a pre-increment ++num2 were used). That is wrong because post-increment returns the old value for the assignment.

6) Conclusion / final confirmation
The blanks should be filled as:
total = num2++; total = 4
num2 = 5

This matches the provided answer: ["4", "5"].

Assume that total, num1, and num2 are int variables, with total = 2, num1 = 3, and num2 = 4. Show the new values of all variables changed by the following: total = num2++;total = [Fill in the blank] num2 = [Fill in the blank] 多项填空题

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