Given the following function. To change the function to return the product instead of the sum, how many lines of code need to be changed?

int Calculate(int a, int b) {
return a + b;
}
int main() {
cout

Question

Given the following function. To change the function to return the product instead of the sum, how many lines of code need to be changed?

int Calculate(int a, int b) {
   return a + b;
}
int main() {
   cout << Calculate(3, 4);
   cout << Calculate(5, 2);
   cout << Calculate(6, 7);
   return 0;
}

BlackTom AI · Accepted Answer

Only the return expression defines the operation performed by Calculate, so changing the '+' to '*' is sufficient.

1) Relevant knowledge points and concepts
- A function’s behavior is determined by its body; callers (calls in main) only provide arguments and receive the result.
- Arithmetic operators (+, *) are evaluated inside the function; changing the operator changes the operation for all calls to that function.
- You do not need to modify each call site when the function itself implements the desired behavior.

2) Step-by-step reasoning
- Label the source lines for clarity:
  1: int Calculate(int a, int b) {
  2:    return a + b;
  3: }
  4: int main() {
  5:    cout << Calculate(3, 4);
  6:    cout << Calculate(5, 2);
  7:    cout << Calculate(6, 7);
  8:    return 0;
  9: }
- The operation that produces the output is at line 2: return a + b;
- To produce products instead of sums, replace the '+' operator with '*': return a * b;
- After this single modification, each call in lines 5–7 will produce products automatically (3*4=12, 5*2=10, 6*7=42), so no other code needs changing.

3) Intermediate steps / examples
- Original outputs (with return a + b): 3+4=7, 5+2=7, 6+7=13.
- After change (return a * b): 3*4=12, 5*2=10, 6*7=42.

4) Why the correct answer is correct
- Only one line (the return expression inside Calculate) controls the arithmetic. Changing that single operator changes the function’s behavior for all calls, so exactly one line must be changed.

5) Why other options are incorrect
- "4": implies modifying all four listed lines (or more) — unnecessary because calls don’t need edits.
- "3": might assume changing each call in main, but changing the function suffices.
- "2": no scenario requires two modifications; only the operator in the function must change.

Conclusion: Only 1 line needs to be changed (line with return a + b), so the correct answer is 1. This matches the provided answer.

Given the following function. To change the function to return the product instead of the sum, how many lines of code need to be changed? int Calculate(int a, int b) { return a + b; } int main() { cout << Calculate(3, 4); cout << Calculate(5, 2); cout << Calculate(6, 7); return 0; }单项选择题

类似问题

What is the output of the following program lines when embedded in a correct program that declares all variables to be of type char? a = ‘c’; b = a; c = ‘a’; cout << a << ‘b’ << c;

What is output? double MyFct(double a, double b) { return (a + b) / 2.0; } int main() { double x = 3.0; double y = 5.0; double z = 8.0; double t; t = MyFct(x, y); t = MyFct(t, z); cout << t << endl; return 0; }

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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;

Given the following function. To change the function to return the product instead of the sum, how many lines of code need to be changed? int Calculate(int a, int b) { return a + b; } int main() { cout << Calculate(3, 4); cout << Calculate(5, 2); cout << Calculate(6, 7); return 0; }

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