C++ overloading with a competing overload that has a default argument: which function is called and what is printed?\n\n#include <iostream.h>\n\nint CuriousTabTest(int x, int y);\nint CuriousTabTest(int x, int y, int z = 5);\n\nint main()\n{\n cout << CuriousTabTest(2, 4) << endl;\n return 0;\n}\n\nint CuriousTabTest(int x, int y) { return x * y; }\nint CuriousTabTest(int x, int y, int z /= 5/) { return x * y * z; }\n

Introduction / Context:
This item examines overload resolution when one overload exactly matches the argument list and another is also viable by supplying a default argument. The C++ rules select the best viable function, favoring an exact arity match over one that relies on defaults.

Given Data / Assumptions:

• Two overloads exist: f(int,int) and f(int,int,int=5).
• Call site: CuriousTabTest(2, 4).
• Both overloads are viable, but one requires using a default argument for the third parameter.

Concept / Approach:
Overload resolution prefers the function that requires no default arguments and exactly matches the number and types of the provided parameters. Therefore CuriousTabTest(int,int) is selected, computing 2 * 4 = 8.

Step-by-Step Solution:

Verification / Alternative check:
If the call were CuriousTabTest(2,4,5), the three-parameter version would be chosen and print 40. Removing the two-parameter overload would also yield 40 due to the default.

Why Other Options Are Wrong:

• 5: Not computed by either overload.
• 40: Would require calling the three-parameter function explicitly (or removing the two-parameter overload).
• Compile time error / None of the above: The overload set is resolvable.

Common Pitfalls:
Thinking the presence of a defaulted parameter forces selection of that overload; in reality, defaults only make a function viable, not necessarily the best match.

Final Answer:
The program will print the output 8.