Best Prolog Books to Buy in October 2025
Programming in Prolog: Using The Iso Standard
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Logic Programming with Prolog
Clause and Effect: Prolog Programming for the Working Programmer
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Prolog Programming for Artificial Intelligence
Learn Prolog Now! (Texts in Computing, Vol. 7)
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The Craft of Prolog (Logic Programming)
Computing With Logic: Logic Programming With Prolog
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Micro-Prolog: Programming in Logic
Prolog: The Standard: Reference Manual
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The Practice of Prolog (Logic Programming)
In Prolog, the syntax for char* is typically represented as a list of characters enclosed in single quotes. For example, a declaration of a char* variable in Prolog could look like this: CharList = ['h', 'e', 'l', 'l', 'o']. This represents the string "hello" as a list of characters.
What is the syntax for declaring a char* pointer in Prolog?
In Prolog, there is no direct equivalent to declaring a char* pointer as you would in languages like C or C++. Prolog does not have a specific data type for character pointers.
However, you can represent strings in Prolog using atoms or lists of characters. Here is an example of declaring a variable that represents a string using an atom:
my_string('hello world').
Alternatively, you can use a list of characters to represent a string in Prolog. Here is an example:
my_string([h,e,l,l,o, ,w,o,r,l,d]).
These are some ways to represent strings in Prolog, but there is no direct equivalent to declaring a char* pointer in Prolog.
What is the syntax for converting an integer to a char* string in Prolog?
To convert an integer to a char* string in Prolog, you can use the number_chars/2 predicate.
Here is an example of converting an integer to a char* string:
% define a predicate to convert an integer to a char* string int_to_string(Int, Str) :- number_chars(Int, Str).
% query the predicate with an example integer ?- int_to_string(123, Str). Str = ['1', '2', '3'].
In the above code, number_chars/2 predicate is used to convert the integer 123 to a char* string ['1', '2', '3'].
What is the syntax for calculating the hash value of a char* string in Prolog?
In Prolog, you can calculate the hash value of a char* string by using the built-in hash_atom/2 predicate. This predicate takes two arguments: the input string and the calculated hash value. Here's the syntax for calculating the hash value of a char* string in Prolog:
calculate_hash(String, HashValue) :- atom_string(Atom, String), hash_atom(Atom, HashValue).
You can call this predicate with a char* string as the first argument and a variable to store the hash value as the second argument. For example:
?- calculate_hash("hello", Hash).
This will calculate the hash value of the string "hello" and bind it to the variable Hash.
How to concatenate two char* strings in Prolog?
In Prolog, you can concatenate two char* strings by using the atom_concat/3 predicate. Here is an example:
concat_strings(String1, String2, Result) :- atom_concat(String1, String2, Result).
You can use this predicate by passing in the two char* strings you want to concatenate and a variable to store the result. For example:
concat_strings('Hello, ', 'world!', Result).
This will unify Result with the string "Hello, world!".
What is the syntax for converting a char* string to a floating-point number in Prolog?
In Prolog, you can convert a char* string to a floating-point number using the built-in predicate number_codes/2. This predicate takes a number as the first argument and a list of ASCII codes representing the characters in the string as the second argument.
Here is an example of how you can use number_codes/2 to convert a char* string to a floating-point number:
?- Number is 10.5, number_codes(Number, "10.5", Codes), number_codes(Float, Codes). Number = 10.5, Codes = [49, 48, 46, 53], Float = 10.5.
In this example, we first define the number 10.5, then convert it to ASCII codes using number_codes/2, and finally convert the ASCII codes back to a floating-point number using number_codes/2.