So, the expression A-B*C+D can be written as A-(B*C)+D. Operator with same precedence value ('*' or '/') and ('+' or '-') should be applied from left to right. Prolog gives numerical value for each operator, operators with high precedence like '*' and '/' are applied before operators with relatively low precedence values like '+' and '-'. If there is more than one operator in the arithmetic expression such as A-B*C+D, then the prolog decides an order in which the operator should be applied. The basic arithmetic operators are given in the following table: In the above example, 'is' is used as a special predefined operator. Prolog arithmetic is slightly different than other programming languages. An expression is either a function or a simple number. The general arithmetic predicates are handled by the expressions. As per the requirement of the user, arithmetic operations can be divided into some special purpose integer predicates and a series of general predicates for integer, floating point and rational arithmetic. Prolog provides the facility for arithmetic operations. The symbol ':-' is used to denote that “Jaya likes delicious food”. In this statement, variable like 'Food' has a first letter in capital, because its value came from previous fact. In the above table, the statement 'Dog is barking' is a fact, while the statement 'Jaya likes food if it is delicious' is called rule. Some examples are explained in the following table. How to convert English to prolog facts using facts and rules?It is very simple to convert English sentence into Prolog facts. Facts consist of a specific item or relation between two or more items. In Prolog, facts are used to form the statements. A fact is something that seems to be true. Prolog is useful in AI, NLP, databases but useless in other areas such as graphics or numerical algorithms. 
After these stages, Prolog interpreter derives the solution.
Prolog is a declarative programming language.įor example: While implementing the solution for a given problem, instead of specifying the ways to achieve a certain goal in a specific situation, user needs to specify about the situation (rules and facts) and the goal (query). It is used in artificial intelligence programming. Prolog stands for Programming in logic.
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