Write a function declaration and a function definition for a function that takes one argument of type int and one argument of type double, and that returns a value of type double that is the average of the two arguments

Question: Write a function in C++ that takes one integer argument and one double argument, and returns the average of the two arguments as a double. Explain the function declaration and definition. Answer: The following function declares and defines a function called `average` that takes an integer and a double as arguments and returns their average as a double. ```cpp // Function declaration double average(int a, double b); // Function definition double average(int a, double b) { double sum = a + b; double avg = sum / 2; return avg; } ``` The function declaration specifies the return type (double), the function name (average), and its arguments' types (int and double). The function definition calculates the average of the two arguments by first adding the integer and double, creating a double result. Then, it divides the sum by 2 and returns the calculated average value, which is a double.