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What is conditional compilation in C?
Conditional compilation is the process of defining compiler directives that cause different parts of the code to be compiled, and others to be ignored. This technique can be used in a cross-platform development scenario to specify parts of the code that are compiled specific to a particular platform.
What is conditional compilation directives?
Conditional compilation directives. The #if and #elif directives, which conditionally include or suppress portions of source code, depending on the result of a constant expression. The #ifdef directive, which conditionally includes source text if a macro name is defined.
What is meant by conditional compilation?
Conditional compilation in C programming language: Conditional compilation as the name implies that the code is compiled if certain condition(s) hold true. Normally we use if keyword for checking some condition so we have to use something different so that compiler can determine whether to compile the code or not.
What is conditional directive?
A block consists of all the tokens starting on the line following the directive and ending at the next conditional compilation directive at the same nesting level. Each directive is processed in the order in which it is encountered. If an expression evaluates to zero, the block following the directive is ignored.
What is #ifdef what is its application?
A common use for the #ifdef directive is to enable the insertion of platform specific source code into a program.
What is conditional inclusion in C?
Conditional inclusion statements are used to prevent multiple inclusion of a header file. The C preprocessor supports conditional compilation of parts of source file. ... C programming language provides #if , #else , #elif , #ifdef , #ifndef , and #endif conditional preprocessor directives.
What does #ifdef mean in C?
Text inside an ifdef/endif or ifndef/endif pair will be left in or removed by the pre-processor depending on the condition. ifdef means "if the following is defined" while ifndef means "if the following is not defined".
What is #ifndef C?
Description. In the C Programming Language, the #ifndef directive allows for conditional compilation. The preprocessor determines if the provided macro does not exist before including the subsequent code in the compilation process.
What is #endif in C?
Description. In the C Programming Language, the #endif directive closes off the following directives: #if, #ifdef, or #ifndef. When the #endif directive is encountered, preprocessing of the opening directive (#if, #ifdef, or #ifndef) is completed.
What is #ifndef #define and #endif used for?
C++ Notes: Preprocessor: #ifdef and #ifndef. The #ifdef (if defined) and #ifndef (if not defined) preprocessor commands are used to test if a preprocessor variable has been "defined".
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