Marks: 30

In this assignment you will be developing a number of functions and procedures. Save all of your work in a file called subs.t and print this out. Marks will be deducted for poor comments, and poor style.

1. Design a function called InToCm that takes a value in inches and returns the equivalent in centimeters. (4 marks)

2. Design a procedure called drawcross that draws a cross on the screen. The parameters will operate in the same fashion as drawstar, except do not allow for inverted crosses. (5 marks)

3. Design a function called invest that will calculate the amount of money you will have if you invest your money over a period of years compounding the money yearly. The procedure will have 3 parameters.

1. Amount of money invested

2. Number of years.

3. Interest rate.

The function will return the total money after the time is up. (5 marks)

4. Design a procedure called order that takes three integer variables and switches their values so that the first paramer holds the smallest value, the second hols the 2^nd largest and the third holds the largest.

5. Design a procedure that draws a grid on the screen. This must be done recursively. You will have a procedure that draws a box, and inside the box draws four grids. ( 5 marks )

6. Multiplying the digits of an integer and continuing the process gives the surprising result that the sequence of products always arrives at a single-digit number. For example:

77 ®49 ® 36 ®18 ®8

88 ® 64 ® 24 ® 8

27 ® 14 ® 4

The number of products necessary to reach the single-digit number is called the persistence number of that integer. Thus 77 has a persistence number of 4, 88 has a percistence of 3, while 27 has persistence 2. Design a function called persistence that takes a single integer(under 100) and results its persistance number. ( 6 marks)

7. Design a menu that will call any of the above subroutines and gives the user a chance to specify values for the parameters. ( 5 marks )