What are macro parameters?
Macro parameters enable you to pass values into the macro at macro invocation, and set default values for macro variables within the macro definition. In this blog post, I also discuss how you can pass in a varying number of parameter values. There are two types of macro parameters: positional and keyword.
What are the functions of macros?
Macro functions include character functions, evaluation functions, and quoting functions. The macro language functions are listed in Macro Functions. mask special characters and mnemonic operators in a resolved value at macro execution. evaluates arithmetic and logical expressions using integer arithmetic.
What type of parameters are used for macro expansion?
Macro definition and Expansion A macro consists of name, set of formal parameters and body of code. The use of macro name with set of actual parameters is replaced by some code generated by its body. This is called macro expansion.
Can macros have parameters?
Function-like macros can take arguments, just like true functions. To define a macro that uses arguments, you insert parameters between the pair of parentheses in the macro definition that make the macro function-like. The parameters must be valid C identifiers, separated by commas and optionally whitespace.
How do you use a macro function?
To create a macro function, simply define a macro with a parameter that has whatever name you like, such as my_val . For example, one macro defined in the standard libraries is abs , which returns the absolute value of its parameter.
How is macro different from function?
The speed at which macros and functions differs….Conclusion:
| Macro | Function |
|---|---|
| Before Compilation, macro name is replaced by macro value | During function call, transfer of control takes place |
| Macros are useful when small code is repeated many times | Functions are useful when large code is to be written |
What are the parameters of a macro in C?
The parameters must be valid C identifiers, separated by commas and optionally whitespace. To invoke a macro that takes arguments, you write the name of the macro followed by a list of actual arguments in parentheses, separated by commas.
How do you define a function like a macro?
Function-like macros can take arguments, just like true functions. To define a macro that uses arguments, you insert parameters between the pair of parentheses in the macro definition that make the macro function-like. The parameters must be valid C identifiers, separated by commas and optionally whitespace.
How do you pass multiple parameters in a macro?
The PARMBUFF option creates a macro variable called &SYSPBUFF that contains the entire list of parameter values, including the parentheses. This enables you to pass in a varying number of parameter values. In the following example, you can pass any number of parameter values to the macro.
What are the benefits of using keyword parameters for macro variables?
The benefit of using keyword parameters is the ability to give the macro variables a default value within the macro definition. When you assign values using keyword parameters, you must include an equal sign after the macro variable name. Here are the log results: