![]() A very simple example would be a program that calculates a mathematical function such as the area of circle, using PI. A macro is a preprocessor directive which allows a programmer to make a textual replacement for some value in code. All arguments to a macro are completely macro-expanded before they are substituted into the macro body. ![]() If you want to supply array x y, x + 1 as an argument, you can write it as array (x y, x + 1), which is equivalent C code. A macro introduces a true inline function that is normally more. macro (array x y, x + 1) passes two arguments to macro: array x y and x + 1. It has the advantages of working for any compatible types of the. In this article, we go over how to create a macro in C. complex scripts for all kinds of tasks such as: form fillers, auto-clicking, macros, etc. The body of a macro is simply used to replace a macro-call during the preprocessing stage. ![]() For more information, see, Macros and C++. The define directive and The undef directive discuss the define and undef directives, respectively. Once youve removed the definition, you can redefine the macro to a different value. Based on your question, a similar question I asked yesterday, and some of the answers, I did a version that tries to have the benefits of all of them.ĭisclaimer: Code is GCC specific (although probably works in similar compilers such as Clang). The following defines a function-like macro which value is the maximum of its arguments. The undef directive removes the definition of a macro.
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