For the following function, which is a valid function call? Assume maxValue is an integer.

int Max(int x, int y) {
   if (x y){
      return x;
   }
   else {
      return y;
   }
}

Question

For the following function, which is a valid function call? Assume maxValue is an integer.

int Max(int x, int y) {
   if (x > y){
      return x;
   }
   else {
      return y;
   }
}

BlackTom AI · Accepted Answer

A valid function call must use the function name, provide the correct number and types of arguments in parentheses, and optionally use the returned value in an assignment. Here the function signature is int Max(int x, int y), so every call must supply two int arguments and returns an int.

Step-by-step reasoning and evaluation:
1. The chosen call is maxValue = Max(15, Max(35, 25)); — this uses the function name Max and supplies two arguments to the outer call: 15 and the result of an inner call Max(35, 25). Nested calls are allowed because Max returns an int and the outer call expects an int as its second parameter.
2. Evaluate the inner call: Max(35, 25).
   - Compare x and y: 35 > 25 is true, so the function returns 35.
   - Result: Max(35, 25) → 35.
3. Evaluate the outer call: Max(15, 35).
   - Compare x and y: 15 > 35 is false, so the function returns y, which is 35.
   - Result: Max(15, 35) → 35.
4. Assign the returned int to maxValue: maxValue = 35. This is type-compatible because maxValue is given as an integer.

Why the correct answer is correct:
- It matches the function signature (two int arguments).
- The nested call is valid because the inner call returns an int suitable as the second parameter to the outer call.
- The final assignment stores the returned int into an int variable.

Why the other options are incorrect:
- "Max = maxValue(15, 25);" attempts to assign to the function name Max (not allowed) and treats maxValue as if it were a function; identifiers are used in the wrong roles and syntax is invalid.
- "maxValue = Max(15 25);" is missing a comma between arguments; this is a syntax error.
- "maxValue = Max();" provides no arguments whereas Max requires two ints; this is a parameter count/type mismatch.

Conclusion: The valid function call is maxValue = Max(15, Max(35, 25)); which matches the provided correct answer.

For the following function, which is a valid function call? Assume maxValue is an integer. int Max(int x, int y) { if (x > y){ return x; } else { return y; } }单项选择题

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