LAB EXERCISES – 13/8/2020
Programming Warm-Up Exercises
1.Write an algorithm for driving from where you live to the nearest airport thathas regularly scheduled flights. Restrict yourself to a vocabulary of 50 wordsplus numbers and place names. You must select the appropriate set of words forthis task. An example of a vocabulary is given in Appendix A, the list ofreserved words (words with special meanings) in the Visual Basic programminglanguage. The purpose of this exercise is to give you practice in writing simple,exact instructions with an equally small vocabulary.
2.Write an algorithm for making a peanut butter and jelly sandwich, using avocabulary of just 50 words (you choose the words). Assume that all ingredientsare in the refrigerator and that the necessary tools are in a drawer under thekitchen counter. The instructions must be very simple and exact because the personmaking the sandwich has no knowledge of food preparation and takes everyword literally.
3.In the following recipe for chocolate pound cake, identify the steps that arebranches (selection) and loops, and the steps that are references tosubalgorithmsoutside the algorithm:
Algorithm:
Preheat the oven to 350 degrees
Line the bottom of a 9-inch tube pan with wax paper
Sift 2 3/4 c flour, 3/4 t cream of tartar, 1/2 t baking soda, 1 1/2 t salt, and 1 3/4 c sugar into a large bowl
Add 1 c shortening to the bowl
If using butter, margarine, or lard, then
add 2/3 c milk to the bowl,
else
(for other shortenings) add 1 c minus 2 T of milk to the bowl
Add 1 t vanilla to the mixture in the bowl
If mixing with a spoon, then
see the instructions in the introduction to the chapter on cakes,
else
(for electric mixers) beat the contents of the bowl for 2 minutes at medium speed, scraping the
bowl and beaters as needed
Add 3 eggs plus 1 extra egg yolk to the bowl
Melt 3 squares of unsweetened chocolate and add to the mixture in the bowl
Beat the mixture for 1 minute at medium speed
Pour the batter into the tube pan
Put the pan into the oven and bake for 1 hour and 10 minutes
Perform the test for doneness described in the introduction to the chapter on cakes
Repeat the test once each minute until the cake is done
Remove the pan from the oven and allow the cake to cool for 2 hours
Follow the instructions for removing the cake from the pan, given in the introduction to the chapter
on cakes
Sprinkle powdered sugar over the cracks on top of the cake just before serving
