Scheme, Assignment 1: Writing Functions
Fall 2005

Create a Scheme directory: mkdir Scheme, cd Scheme
To start Scheme type: "drscheme" or choose from the Applications/Programming menu
- The upper window is used to edit your program file
- The lower window is used to enter commands to run functions/programs
- You need to click on the "Run" button ("Execute" on Windows systems) to load the program
  code into the interpreter.
Choose the correct Language (see the Language menu): Pretty Big in the PLT sub menu

Example Scheme functions:

;;Exer 2.2.1 from How to Design Programs
(define (Fahrenheit->Celsius temp)
  (* 5 (/ (- temp 32) 9)))

The formula here is: Celsius = (Fahrenheit - 32) * (5/9)

Load this function into the upper window of DrScheme.
   Click on the "Run" ("Execute" in Windows) button, upper right.
   In the lower window (or add these as commands in your program)
> (fahrenheitToCelsius 79)
26 1/9

Exer. 2.2.3

;;Exer 2.2.3 from How to Design Programs
(define (triangle base height)     ;; Load the function definition in the top
  (* .5 base height))		   ;; window.	
 
> (triangle 45 89)                 ;; After pressing "Run", enter this in the 
2002.5				   ;; lower window
>

Scheme assignment 1: Write the following functions:

"convert3" Exer. 2.2.4
```
 > (convert3 5 2 8)
825
 
```
volume-cylinder Exer. 3.3.2 from Chapter 3
```
> (volume-cylinder 10 24)
7539.816
 
```

area-cylinder Exer. 3.3.3

> (area-cylinder 10 24)
2136.2812000000004

area-pipe Exer. 3.3.4

> (area-pipe 10 24 .2)
3046.0856639999997

rocket-height Exer. 3.3.5
```
> (rocket-height 10 60)
18000.0
 
```

Scheme, Assignment 1: Writing Functions Fall 2005

Scheme, Assignment 1: Writing Functions
Fall 2005