difference between recursive descent parser and non recursive descent parser

Recursive descent parsers and non-recursive descent parsers are both top-down parsing techniques used to analyze the structure of a programming language or text according to a set of grammar rules. However, they differ in their approach:

Recursive Descent Parser:

Structure: Relies on recursive functions, where a function can call itself.

Process: Breaks down the input string by matching it against grammar rules. For each non-terminal symbol encountered, a corresponding function is called to handle its expansion. This function call can lead to further function calls for sub-expressions within the rule.

Advantages:

• Simple and elegant implementation, especially for simple grammars.
• Easy to understand and reason about.