Which XXX is valid for the following code?

int CalcSum(int a, int b) {
   return a + b;
}
int main() {
   int y;
   XXX
   return 0;
}

Question

Which XXX is valid for the following code?

int CalcSum(int a, int b) {
   return a + b;
}
int main() {
   int y;
   XXX
   return 0;
}

BlackTom AI · Accepted Answer

CalcSum takes two int parameters and returns their integer sum, so a valid call must supply exactly two int arguments and can be assigned to an int variable.

1) Relevant knowledge points and concepts
- Function signature: int CalcSum(int a, int b) — this declares a function that accepts two int parameters and returns an int.
- Function call arity: the number of arguments in the call must match the number of parameters in the declaration.
- Types must be compatible: the returned int can be assigned to an int variable (y).
- Syntax: function calls require parentheses, comma-separated arguments, and a terminating semicolon in C/C++.

2) Step-by-step reasoning
- The main function declares int y;
- We must replace XXX with a statement that calls CalcSum with two ints and stores the result into y.
- The call y = CalcSum(4, 5); matches the signature: two ints (4 and 5) are passed into a and b respectively, and the returned int is stored in y.

3) Intermediate calculation steps
- When CalcSum(4, 5) executes: a = 4, b = 5.
- The function computes a + b = 4 + 5 = 9.
- The function returns 9.
- The assignment y = 9 stores the value 9 into y.

4) Why the correct answer is correct
- y = CalcSum(4, 5); supplies the correct number and types of arguments, uses the returned int properly, and respects syntax. It will compile and set y to 9.

5) Why the other options are incorrect
- CalcSum(y, 4, 5); supplies three arguments while the function expects two (compile-time error). It also uses y uninitialized.
- y = CalcSum(4 + 5); supplies one argument (an expression), but the function expects two separate arguments (compile-time error).
- y = CalcSum(); supplies zero arguments, but two are required (compile-time error).

6) Conclusion
The valid replacement for XXX is y = CalcSum(4, 5); — this matches the provided correct answer.

Which XXX is valid for the following code? int CalcSum(int a, int b) { return a + b; } int main() { int y; XXX return 0; }单项选择题

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