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Lisp has a number of built in data types. Integers and strings, for example, aren't much different from what you're used to. The meaning of 71 or "hello" is roughly the same in Lisp as in C++ or Java. What is of more interest to us are symbols, lists, and functions. I will spend the rest of this section describing these data types as well as how a Lisp environment compiles and executes the source code you type into it (this is called evaluation in Lisp lingo). Getting through this section in one piece is important for understanding true potential of Lisp's metaprogramming, the unity of code and data, and the notion of domain specific languages. Don't think of this section as a chore though, I'll try to make it fun and accessible. Hopefully you can pick up a few interesting ideas on the way. Ok. Let's start with Lisp's symbols.

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Usefulness of trees essay writing - …


Fruit trees are an important source of income and food for the rural household. In some areas fruit trees are commonly planted along the field borders and around the wells. Mango, coconut, orange, pear, jackfruit and many others grow wild in the forest.

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Author: Marc Sheehan

Title of Lesson: Trees and their Uses

Time: 25-30 minutes

Grade Level: Kindergarten

Idea Supplied By: Barbara Egan, Mark Twain Elementary (Federal Way, WA)

Materials: The Giving Tree (Shel Silverstein), Plants of the Pacific Northwest Coast (Jim Pojar), 30 leaves ( 10 Alder, 10 Bigleaf Maple, 10 Vine Maple), crayons, white paper, butcher paper, pen

Objectives: The students will identify 3-4 ways how trees are used. The students will produce 3 leaf rubbings using one color for each leaf.

Introduction: The lesson will open with the reading of Shel Silverstein's The Giving Tree. Students will be instructed to note how the tree was used in the story.

Procedure: When the story is finished, the students will be asked how the tree in the story was used. The answers will be recorded on the butcher paper. The students will also be asked to state other ways that trees are used. The answers will also be recorded. Next, the leaves of the Alder, Bigleaf Maple, and Vine Maple will be shown to the students. The uses of each tree will be described, using Plants of the Pacific Northwest Coast as the source.

Once the leaves are presented, then the students will be shown how to do leaf rubbings. The leaf will be placed on a flat surface and covered with a piece of white paper. Next, a crayon will be rubbed gently over the paper so that the features of the leaf appear. Pre-made examples of all three leaf rubbings will be presented for the students to look at. The students will then be dismissed to their tables to work on the rubbings. They will be instructed to share the leaves, work as neatly as possible, and use one color for each leaf.

Closure: The leaf rubbings will be collected, stapled together, and sent home with the students.

Assessment: The rubbings will be looked over to see if they were completed neatly and in one color.

Modifications for Special Needs: The coloring should help to develop and maintain fine motor skills. The students could also focus on completing a task with few or no interruptions, maintaining attention, sitting quietly, and working neatly.

Possible Extensions: More leaf rubbings could be made for a leaf book. Students could also make bark rubbings. The list of tree uses could be recorded in student journals. Students could also go on a nature walk to identify various trees on the school grounds.

Importance of Trees in our Life - Wabs Talk


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It’s my belief that the more you know and understand the usefulness of different species of tree, then the more you will value our trees and our woodland as a whole.

you know and understand the usefulness of different ..

Like Oaks, Beech trees can grow to be very large indeed. The wood is not as strong, however, and is prone to infection, so you’ll often find large Beeches in the process of falling apart. Never camp underneath a Beech tree, for this reason. However, dropped limbs provide another very good source of firewood. Beech coals are also very good for roasting food over. In the spring, brand new, light green Beech leaves are edible for a little while after they emerge from the buds. They are surprisingly tasty. The buds themselves are distinctive, slender and pointed with obvious scales. Over the summer, Beech masts form and these are also edible (there’s a knack to getting into them). You can snack on them raw but you get more nutritional value from them cooked.

The Importance of Trees - The Woodturners Workshop

We could do the same with XML. Of course the line above isn't really a list, it's a tree, just like its XML-alternative. Don't let references to lists confuse you, it's just that lists that contain other lists and trees are effectively the same thing. Lisp may stand for List Processing, but it's really tree processing - no different than processing XML nodes.

Essay about plants and their importance of …

What does this line do? It's a simple instruction written in the preprocessor language that instructs it to replace all instances of triple(X) with X + X + X. For example all instances of 'triple(5)' will be replaced with '5 + 5 + 5' and the resulting code will be compiled by the C compiler. We're really doing a very primitive version of code generation here. If only C preprocessor was a little more powerful and included ways to connect to the database and a few more simple constructs, we could use it to develop our data access layer right there, from within our program! Consider the following example that uses an imaginary extension of the C preprocessor: