What is the output of the following program segment?

double temp[5];
for (int i = 0; i

Question

What is the output of the following program segment?

double temp[5];
    for (int i = 0; i < 5; i++)
        temp[i] = pow(i, 2.0) + 3;
    temp[0] = pow(temp[1], 3);
    temp[1] = temp[4] - temp[2];
    temp[2] = temp[0] - 4;
    cout << temp[2] << endl;

BlackTom AI · Accepted Answer

Initialize temp[i] = i^2 + 3, so the first computed array values are temp = {3, 4, 7, 12, 19}.

1. Relevant knowledge points and concepts
- Array indexing and assignment in C++: assignments occur in sequence and overwrite previous values.
- The pow(x, y) function computes x to the power y (as a double).
- Order of statements matters: later assignments use the current values of array elements.

2. Step-by-step reasoning
- Loop: for i from 0 to 4, temp[i] = pow(i, 2.0) + 3.
  - i = 0: pow(0,2.0) + 3 = 0 + 3 = 3 → temp[0] = 3
  - i = 1: pow(1,2.0) + 3 = 1 + 3 = 4 → temp[1] = 4
  - i = 2: pow(2,2.0) + 3 = 4 + 3 = 7 → temp[2] = 7
  - i = 3: pow(3,2.0) + 3 = 9 + 3 = 12 → temp[3] = 12
  - i = 4: pow(4,2.0) + 3 = 16 + 3 = 19 → temp[4] = 19
  After loop: temp = {3, 4, 7, 12, 19}.

- Next statement: temp[0] = pow(temp[1], 3);
  - temp[1] is 4, so pow(4,3) = 4 * 4 * 4 = 64 → temp[0] = 64.
  Now temp = {64, 4, 7, 12, 19}.

- Next: temp[1] = temp[4] - temp[2];
  - temp[4] = 19 and temp[2] = 7, so 19 - 7 = 12 → temp[1] = 12.
  Now temp = {64, 12, 7, 12, 19}.

- Next: temp[2] = temp[0] - 4;
  - temp[0] = 64, so 64 - 4 = 60 → temp[2] = 60.
  Final temp = {64, 12, 60, 12, 19}.

3. Intermediate calculations shown above for each assignment.

4. Why the correct answer is correct
Because after the sequential updates, temp[2] is explicitly set to temp[0] - 4, and temp[0] had been set to 64 (pow(4,3)), so temp[2] becomes 64 - 4 = 60. The cout prints that value.

5. Other options / common mistakes
There are no provided multiple-choice options. Common errors would be miscomputing pow(4,3) as 4^3 = 64 (correct) vs confusing ^ with XOR, or forgetting that earlier assignments change values used later.

6. Conclusion
The output printed by cout << temp[2] << endl; is 60, which matches the provided answer.

What is the output of the following program segment? double temp[5]; for (int i = 0; i < 5; i++) temp[i] = pow(i, 2.0) + 3; temp[0] = pow(temp[1], 3); temp[1] = temp[4] - temp[2]; temp[2] = temp[0] - 4; cout << temp[2] << endl;数值题

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