Mastering C++ Functions

Q1. What is the correct syntax for defining a function in C++?

• • int func_name(int x);

• • func_name int(int x);

• • int func_name(int x) { ... };

• • void func_name { int x };

Q2. Which of the following statements about function overloading is true?

• Function overloading requires all functions to have exactly the same parameters.

• Function overloading can only be done with return types.

• Function overloading allows multiple functions with the same name but different parameters.

• Function overloading is not supported in object-oriented programming.

Write a function that takes two integers as parameters and returns their product.

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Write a program with a function that calculates and returns the average of three integers.

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Write a function that swaps the values of two integer variables. Use this function in main.

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Q6. What is the return type of a function that does not return a value?

• int

• float

• void

• string

Consider the following code. What will be the output?

• 25

• 15

• 30

• Error: missing argument for y

Q8. What is the purpose of the 'return' statement in a function?

• To define the parameters of a function.

• The purpose of the 'return' statement is to provide a value from a function to its caller.

• To create a loop within a function.

• To end the execution of a function immediately.

What will be the output of the following code?

• 20

• 10

• • Error: parameter a not initialized

• • Undefined behavior

Answer explanation

The function modify takes a by value, meaning it works on a copy of x. Changes to a inside modify do not affect x in main. Therefore, cout << x; outputs 10.

Q10. What is the difference between a function declaration and a function definition?

• A function declaration introduces a function's name and parameters, while a function definition includes the complete implementation of the function.

• A function declaration is used to call a function, while a function definition is used to create a variable.

• A function declaration includes the complete implementation, while a function definition only introduces the function's name.

• A function declaration and definition are the same and can be used interchangeably.