
Basic Data Operation

This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:


Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |
Comparison |
Matching
Memory Operations
Pointers & references |
Addresses


Task

Demonstrate how to compare two strings from within the language and how to achieve a lexical comparison.



The task should demonstrate:

 Comparing two strings for exact equality
 Comparing two strings for inequality (i.e., the inverse of exact equality)
 Comparing two strings to see if one is lexically ordered before than the other
 Comparing two strings to see if one is lexically ordered after than the other
 How to achieve both case sensitive comparisons and case insensitive comparisons within the language
 How the language handles comparison of numeric strings if these are not treated lexically
 Demonstrate any other kinds of string comparisons that the language provides, particularly as it relates to your type system. 


For example, you might demonstrate the difference between generic/polymorphic comparison and coercive/allomorphic comparison if your language supports such a distinction.



Here "generic/polymorphic" comparison means that the function or operator you're using doesn't always do string comparison, but bends the actual semantics of the comparison depending on the types one or both arguments; with such an operator, you achieve string comparison only if the arguments are sufficiently string-like in type or appearance.

In contrast, a "coercive/allomorphic" comparison function or operator has fixed string-comparison semantics regardless of the argument type;   instead of the operator bending, it's the arguments that are forced to bend instead and behave like strings if they can,   and the operator simply fails if the arguments cannot be viewed somehow as strings.   A language may have one or both of these kinds of operators;   see the Raku entry for an example of a language with both kinds of operators.




Other tasks related to string operations:

Metrics
 Array length
 String length
 Copy a string
 Empty string  (assignment)
Counting
 Word frequency
 Letter frequency
 Jewels and stones
 I before E except after C
 Bioinformatics/base count
 Count occurrences of a substring
 Count how many vowels and consonants occur in a string
Remove/replace
 XXXX redacted
 Conjugate a Latin verb
 Remove vowels from a string
 String interpolation (included)
 Strip block comments
 Strip comments from a string
 Strip a set of characters from a string
 Strip whitespace from a string -- top and tail
 Strip control codes and extended characters from a string
Anagrams/Derangements/shuffling
 Word wheel
 ABC problem
 Sattolo cycle
 Knuth shuffle
 Ordered words
 Superpermutation minimisation
 Textonyms (using a phone text pad)
 Anagrams
 Anagrams/Deranged anagrams
 Permutations/Derangements
Find/Search/Determine
 ABC words
 Odd words
 Word ladder
 Semordnilap
 Word search
 Wordiff  (game)
 String matching
 Tea cup rim text
 Alternade words
 Changeable words
 State name puzzle
 String comparison
 Unique characters
 Unique characters in each string
 Extract file extension
 Levenshtein distance
 Palindrome detection
 Common list elements
 Longest common suffix
 Longest common prefix
 Compare a list of strings 
 Longest common substring
 Find common directory path
 Words from neighbour ones
 Change e letters to i in words
 Non-continuous subsequences
 Longest common subsequence
 Longest palindromic substrings
 Longest increasing subsequence
 Words containing "the" substring
 Sum of the digits of n is substring of n
 Determine if a string is numeric
 Determine if a string is collapsible
 Determine if a string is squeezable
 Determine if a string has all unique characters
 Determine if a string has all the same characters
 Longest substrings without repeating characters
 Find words which contains all the vowels
 Find words which contains most consonants
 Find words which contains more than 3 vowels
 Find words which first and last three letters are equals
 Find words which odd letters are consonants and even letters are vowels or vice_versa
Formatting
 Substring
 Rep-string
 Word wrap
 String case
 Align columns
 Literals/String
 Repeat a string
 Brace expansion
 Brace expansion using ranges
 Reverse a string
 Phrase reversals
 Comma quibbling
 Special characters
 String concatenation
 Substring/Top and tail
 Commatizing numbers
 Reverse words in a string
 Suffixation of decimal numbers
 Long literals, with continuations 
 Numerical and alphabetical suffixes
 Abbreviations, easy
 Abbreviations, simple
 Abbreviations, automatic
Song lyrics/poems/Mad Libs/phrases
 Mad Libs
 Magic 8-ball
 99 Bottles of Beer
 The Name Game (a song)
 The Old lady swallowed a fly
 The Twelve Days of Christmas
Tokenize
 Text between
 Tokenize a string
 Word break problem
 Tokenize a string with escaping
 Split a character string based on change of character
Sequences
 Show ASCII table
 De Bruijn sequences
 Self-referential sequences
 Generate lower case ASCII alphabet




 
  a="BALL";
  b="BELL";
 
  if a==b, disp('The strings are equal'); end; 
  if strcmp(a,b), disp('The strings are equal'); end; 
  if a~=b, disp('The strings are not equal'); end; 
  if ~strcmp(a,b), disp('The strings are not equal'); end; 
  if a > b, disp('The first string is lexically after than the second'); end; 
  if a < b, disp('The first string is lexically before than the second'); end; 
  if a >= b, disp('The first string is not lexically before than the second'); end; 
  if a <= b, disp('The first string is not lexically after than the second'); end; 
 
  % to make a case insensitive comparison convert both strings to the same lettercase:
  a="BALL";
  b="ball";
  if strcmpi(a,b), disp('The first and second string are the same disregarding letter case'); end;
  if lower(a)==lower(b), disp('The first and second string are the same disregarding letter case'); end;
 
 