paraméterátadás

Paraméterátadás refers to the mechanism by which information is passed from one part of a computer program to another, typically from a calling function to a called function. This information, known as a parameter or argument, allows functions to operate on different data without needing to be rewritten. The way parameters are passed can significantly impact program behavior and performance.

There are generally two primary methods of parameter passing: pass-by-value and pass-by-reference. In pass-by-value, a copy of the parameter's value is made and sent to the called function. Any modifications made to the parameter within the called function affect only the copy, not the original value in the calling function.

In contrast, pass-by-reference involves passing the memory address of the parameter. This means the called function works directly with the original data. Consequently, changes made to the parameter within the called function are reflected in the original variable in the calling function.

Some programming languages also support hybrid approaches or variations, such as pass-by-pointer, which is similar to pass-by-reference but involves an explicit pointer variable. Understanding the specific parameter passing mechanism used by a programming language is crucial for writing correct and predictable code. Different languages may default to one method or allow the programmer to explicitly choose between them.