What is the purpose of this table?

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Discussion Overview

The discussion revolves around the comparison of strings in Scheme programming, specifically focusing on the function that compares the first elements of a list containing both a string and a numeral. Participants explore the implications of ASCII values and alphabetical order in this context.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the result of a Scheme function that compares the first elements of a list, questioning what those elements are.
  • Another participant suggests that under ASCII, '1' is less than 'a'.
  • Several participants explain that string comparison typically uses alphabetical order or ASCII values, noting the hierarchy of characters.
  • There is a challenge regarding how to compare a letter and a numeral, indicating a potential ambiguity in the comparison process.
  • A link to an ASCII table is provided for reference, suggesting that it may help clarify the comparison of characters.

Areas of Agreement / Disagreement

Participants generally agree on the use of ASCII values for string comparison, but there remains uncertainty regarding the comparison of letters and numerals, indicating a lack of consensus on how to approach this specific case.

Contextual Notes

The discussion does not resolve how to compare a letter and a numeral, and it relies on the assumption that participants are familiar with ASCII values and string comparison in programming.

MissP.25_5
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I am learning scheme programming.
What is the result of this?

(define (small a b)
(string<? (first a) (first b))

And the list is (list "apple" "100 yen").

What is the first a and what is the first b? Is it "a" and "1"? If so, between these two, which is lesser?
 
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Assuming ascii, then '1' is less than 'a'.
 
When you compare strings you use alphabetical order, or ASCII values of the characters.

numerals ( 0 1 ...) < UPPER CASE LETTERS < lower case letters
 
Willy_B said:
When you compare strings you use alphabetical order, or ASCII values of the characters.

numerals ( 0 1 ...) < UPPER CASE LETTERS < lower case letters

But here we have both numbers and letters. How do you compare a and 1?
 

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