View Discussion Show Improve Article Save Article View Discussion Improve Article Save Article There are different ways in which parameter data can be passed into and out of methods and functions. Let us assume that a function B() is called from another function A(). In this case A is called the “caller function” and B is called the “called function or callee function”. Also, the arguments which A sends to B are called actual arguments and the parameters of B are called formal arguments. Terminology
Important methods of Parameter Passing
Other methods of Parameter Passing These techniques are older and were used in earlier programming languages like Pascal, Algol and Fortran. These techniques are not applicable in high level languages.
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Why can we not modify parameter variables in a function?The problem here is that if the input parameters are modified at some point in the routine, they will no longer represent their original values. Then, developers who come later may be operating under some false assumptions. This then leads to severe bugs in logic, that aren't easily caught.
What are the three semantic models of parameter passing?Semantic Models of Parameter Passing
Formal parameters are characterized by one of three distinct semantic models: in mode: They can receive data from corresponding actual parameters. out mode: They can transmit data to the actual parameter. inout mode: They can do both.
Can a function modify parameter?By-Value: The value of a variable is sent to function. The actual parameter cannot be changed by function.
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