C++ Functions

Examples (3/6/13):

• Function prototypes I
• Inline functions I

Answer and discuss the following questions:

• Function return I
• Function return II
• Void functions I
• Functions by value
• Functions by reference

Complete these programming projects:

1. Write and test the void function printfactorial( int n ) that prints the factorial of an input integer. For example:

If printfactorial( 3 ), output is:

   3! = 3 * 2 * 1 = 6
   
If printfactorial( 4 ), output is:

   4! = 4 * 3 * 2 * 1 = 24

See printfactorial program developed in class.

2. Write a C++ program printTable.cpp that utilizes looping and the tab escape sequence \t to print the following table of values:

   N    10*N    100*N   1000*N

   1    10      100     1000
   2    20      200     2000
   3    30      300     3000
   4    40      400     4000
   5    50      500     5000

3. Write a program evenFunction.cpp that inputs a series of integers and passes them one at a time to a function called even, which uses the modulus (%) operator to determine whether the integers are even. The even function should take an integer input parameter and have an integer return type. The program should print whether each integer that you input is EVEN or ODD.

4. In the program temperatureTable.cpp implement the following functions:

• Function toCelsius returns the Celsius equivalent of a Fahrenheit temperature.
• Function toFahrenheit returns the Fahrenheit equivalent of a Celsius temperature.

All inputs to and returns from the functions will be integer. Use these two functions in the temperatureTable.cpp program to print charts showing the Fahrenheit equivalents of all Celsius temperatures from 0 to 100 degrees, and the Celsius equivalents of all Fahrenheit temperatures from 32 to 212 degrees. Print the outputs in a neat tabular format that minimizes the number of lines of output while remaining readable.

Note:

   
 celsius = 5.0 / 9.0 * ( fahrenheit - 32 );
 fahrenheit = (9.0 / 5.0 * celsius) + 32 ;