Online Coding Lessons C and C++ Coding 4

Question 1

In C, what is the value of an array name when used in most expressions?

Accepted Answer

A pointer to the first element

Answer

An array name decays to a pointer to its first element in most contexts.

Question 2

Which C++ access specifier makes members accessible only within the class itself?

Accepted Answer

private

Answer

private members can only be accessed from within the same class.

Question 3

What does the C function strlen return for the string "hello"?

Accepted Answer

5

Answer

strlen counts characters up to but not including the null terminator, giving 5.

Question 4

In C++, what does the 'virtual' keyword enable for a base class function?

Accepted Answer

Runtime polymorphism via dynamic dispatch

Answer

virtual functions are resolved at runtime, enabling polymorphic behavior through base pointers.

Question 5

What is the correct format specifier to print a floating-point double with printf in C?

Accepted Answer

%f

Answer

%f is used to print float and double values with printf.

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