C++ function with multiple defaulted parameters used as a polynomial: compute two outputs for x = 2.3. #include <iostream.h> double CuriousTabFunction(double, double, double = 0, double = 0, double = 0); int main() { double d = 2.3; cout << CuriousTabFunction(d, 7) << " "; cout << CuriousTabFunction(d, 7, 6) << endl; return 0; } double CuriousTabFunction(double x, double p, double q, double r, double s) { return p + (q + (r + s * x) * x) * x; // Horner-like form }

Introduction / Context: The function evaluates a cubic-like expression using Horner-style nesting. Default arguments make most coefficients zero unless explicitly provided. You must track which parameters receive values and which default to zero.

Given Data / Assumptions:

• x = 2.3.
• First call: p = 7, q = r = s = 0.
• Second call: p = 7, q = 6, r = s = 0.

Concept / Approach: For the first call, every nested term beyond p cancels to zero, leaving p. For the second call, only q contributes beyond p, scaled by x once. Evaluating carefully yields numeric results.

Step-by-Step Solution:

Verification / Alternative check: Writing the general form as p + qx + rx^2 + sx^3 confirms that only qx contributes in the second call.

Why Other Options Are Wrong:

• 7 20: Misses the 0.8 contribution of 60.133..; numerically incorrect.
• 7 19.8: Off by 1.0; likely mistaken sign.
• 7 Garbage / None of the above: All arguments are defined and the math is straightforward.

Common Pitfalls: Misplacing parentheses in nested expressions, or forgetting that only q survives when r and s are zero.

Final Answer: 7 20.8