A function call is an expression that executes a named function, passing any required arguments to it. It allows a programmer to invoke a specific piece of code to perform a desired task or operation.
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A function call consists of the function name followed by parentheses, which may contain arguments.
Arguments passed to a function can be literal values, variables, or expressions that evaluate to the required data types.
Functions can have default parameter values, which are used if no argument is provided for that parameter during the function call.
Keyword arguments allow arguments to be specified by name, rather than relying on their order, providing more flexibility in function calls.
The return value of a function can be assigned to a variable or used directly in an expression, enabling the function's output to be further processed.
Review Questions
Explain the purpose of a function call and how it relates to the function definition.
The function call is the mechanism by which a programmer invokes a specific function to perform a desired task or operation. It allows the code within the function definition to be executed, with any required arguments passed to the function. The function call is the point where the function is actually used, while the function definition specifies the name, parameters, and logic of the function.
Describe how keyword arguments can be used in function calls and the benefits they provide.
Keyword arguments allow arguments in a function call to be specified by name, rather than relying on their order. This provides more flexibility and clarity in function calls, as the programmer can explicitly state which argument corresponds to which parameter. Keyword arguments are particularly useful when a function has many parameters, as they make the function call more self-documenting and reduce the likelihood of passing arguments in the wrong order.
Analyze the role of return values in function calls and how they can be used to extend the functionality of a program.
The return value of a function call is the output or result produced by the function's code. This return value can be assigned to a variable or used directly in an expression, allowing the function's output to be further processed or incorporated into the program's logic. By leveraging return values, programmers can build more modular and reusable code, where functions perform specific tasks and return meaningful results that can be utilized elsewhere in the program. This enhances the overall flexibility and extensibility of the codebase.