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

The function's behavior is determined by its return statement. Changing the operation inside that single line changes the result for every call.

1) Relevant knowledge points and concepts
- Functions encapsulate behavior; the return statement defines the value produced.
- Changing logic inside a function updates behavior everywhere the function is called; callers need no changes if the signature (name, parameter types, order) remains the same.
- Basic arithmetic operators: + (sum) versus * (product).

2) Step-by-step reasoning
- Inspect the code: Calculate is defined as:
  int Calculate(int a, int b) {
    return a + b;
  }
- The three calls in main are: Calculate(3,4), Calculate(5,2), Calculate(6,7). They rely entirely on Calculate's return expression.
- To make Calculate produce a product instead of a sum, replace the + operator with * in the return statement.
- No other lines reference the internal implementation; they call Calculate with the same parameters and print the returned value. So only one line needs alteration.

3) Calculations / intermediate steps (illustrative)
- Original outputs if unchanged: Calculate(3,4) -> 3 + 4 = 7; Calculate(5,2) -> 7; Calculate(6,7) -> 13.
- After changing return to a * b: Calculate(3,4) -> 3 * 4 = 12; Calculate(5,2) -> 10; Calculate(6,7) -> 42.
- These changes come solely from modifying the single return expression.

4) Why the correct answer is correct
- The functional change (sum to product) is implemented entirely by replacing "+" with "*" in the return statement. That is a single-line change. Function signature and all call sites remain valid and require no edits.

5) Why the other options are incorrect
- "3" or "4": imply multiple lines (e.g., changing each call site); unnecessary because one change in the function affects all calls.
- "2": implies an additional change beyond the return line (for example, changing a call or prototype), which is not required since the signature stays the same.

6) Conclusion
Only one line must be changed (the return statement). This matches the provided correct answer: 1.

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

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