C++ 1(A). Indicate which of the following is the function prototype, the function header, and the function call:
void showNum(double num)
void showNum(double);
showNum(45.67);
(B) The following program skeleton asks for the number of hours you’ve worked and your hourly pay rate. It then calculates and displays your wages. The function showDollars, which you are to write, formats the output of the wages.
#include
#include
using namespace std;
void showDollars(double pay); // Function prototype
int main()
{
double payRate, hoursWorked, wages;
cout << "How many hours have you worked? "
cin >> hoursWorked;
cout << "What is your hourly pay rate? ";
cin >> payRate;
wages = hoursWorked * payRate;
showDollars(wages);
return 0;
}
// Write the definition of the showDollars function here.
// It should have one double parameter and display the message
// "Your wages are $" followed by the value of the parameter.
(C) The following statement calls a function named half, which returns a value that is half that of the argument passed to it.
result = half(number);
Assume that result and number have both been defined to be double variables. Write the half function.
(D) A program contains the following function.
int cube(int num)
{
return num * num * num;
}
Write a statement that passes the value 4 to this function and assigns its return value to the variable result.