So from a terminal, issue the command: emacs hello. That's it, short and sweet. So first, save the buffer. As this requires no user input, we are ready to compile. So click on the tools menu item and select compile. Then backspace over the make -k item which will appear, and replace it with the command :. A message will appear in the compilation buffer telling you that the operation was a success, and the message "Hello World" will be displayed. Next, we will show you a simple program to compute the powers of the first twenty five integers for the radix from 1 to 5.
And, we are going to display the data in a nicely formatted report.
A picture is said to be worth a words, so here is a snap of the program and its output as entered and compiled in emacs:. Now would be a good time to introduce some of the features which seem to be unique to the Icon language. The first item, which I had never heard about, is an item called cset. This is mentioned quite a bit, however. What it means is seemingly taken for granted. Essentially, a cset is a set of all the characters within a given string.
Now a set is defined as only containing one of each type item. So, if a string contains two or more of the same letter only one would be included in the cset. Also the items are arranged in order. The upper case letters are before the lower case items and numbers are before letters. So the cset of "hello" would be "ehlo. It is easy to learn the cset of an item by casting this into a main procedure and compiling it in emacs. As you might expect, these raise hell with the spell checkers.
The execution of conditional statements is based on the concept of success or failure. An item which might have several answers may be suspended once the first success if found, and then continued after this to go on to find other answers. When all possible answers have been found, it would then fail.
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Guildhall Preparation: Programming
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The Icon Programming Language (Prentice-hall Software Series)
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