By James S. Coan

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To arrange the letters of a string in alphabetical order we may first store the coded values in a list. We then arrange the coded values in numeric order and convert the numeric list back to a string for printing, as shown in program ALP HAl. Similarly, we can reverse the order of the letters in a string with the procedure of program REVRSl. Look particularly at line 150 to see that the B list is filled in the reverse order from the contents of the A list. We can compare strings as a means of coding information.

Order comparison is accomplished according to ASCII (American Standard Code for Information Interchange) specifications, which place the digits in order 0 through 9 ahead of the letters of the alphabet in alphabetical order. " We do not need to numerically code our answers to questions put to the program user. If we wish to give the program operator options, the answers can be words which the computer processes directly. If for example, we write a program that will require a lot of yes-no answers from the keyboard, we may write 31 32 Advanced BASIC a subroutine that prints the question, checks the answer to be sure that it is either a "YES" or a "N't)," and rerequests the answer for all other responses.

T AB(X) placed in a PRINT statement causes the printing mechanism of the terminal to be located in the xth space of the current line, provided it has not already passed that point. Note that on most systems the leftmost space is numbered zero and the counting is modular, with the mod being typically 72 or 75, but sometimes more. Some systems are not modular but start on a new line when the TAB argument exceeds the system line length. An explicit number or BASIC formula may be entered as the argument of the TAB function.

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