What is meant by conditional compilation What are its advantages?

What is meant by conditional compilation What are its advantages?

Conditional compilation allows you to maintain more than one version of a program in a single source file. If you’re like most Clipper developers who create and maintain their own function libraries, you could use conditional compilation to test code contained in each function’s source file.

Why is conditional compilation used?

Conditional compilation provides a way of including or omitting selected lines of source code depending on the values of literals specified by the DEFINE directive. This means that conditional compilation directives may be used to exclude COPY and REPLACE statements from a program.

What is the use of conditional compilation in C?

Conditional Compilation: Conditional Compilation directives help to compile a specific portion of the program or let us skip compilation of some specific part of the program based on some conditions.

What is conditional compilation explain with example?

Conditional compilation is the process of selecting which code to compile and which code to not compile similar to the #if / #else / #endif in C and C++. Any statement that is not compiled in still must be syntactically correct. Conditional compilation involves condition checks that are evaluable at compile time.

What is conditional compilation in preprocessor?

A preprocessor conditional compilation directive causes the preprocessor to conditionally suppress the compilation of portions of source code. The directives are: The #if and #elif directives, which conditionally include or suppress portions of source code, depending on the result of a constant expression.

What do you understand by conditional compilation directive?

Conditional Compilation directives are type of directives which helps to compile a specific portion of the program or to skip compilation of some specific part of the program based on some conditions. This can be done with the help of several preprocessing commands #if, #ifdef, #ifndef, #if, #endif, #else and #elif.

What is conditional compilation in Java?

The conditional compilation practice is used to optionally remove chunks of code from the compiled version of a class. It uses the fact that compilers will ignore any unreachable branches of code. To implement conditional compilation, define a static final boolean value as a non-private member of some class.

What is compilation conditions in Swift?

Active Compilation Conditions is a new build setting for passing conditional compilation flags to the Swift compiler. Each element of the value of this setting passes to swiftc prefixed with -D , in the same way that elements of Preprocessor Macros pass to clang with the same prefix. ( 22457329)

Does Java have preprocessor?

Java doesn’t have a preprocessor, yet that doesn’t mean that you can’t run Java code through cpp – though it would not be supported by any tools, AFAIK.

Does Java have Ifdef?

Java does not have any form of the C #ifdef or #if directives to perform conditional compilation. Thus, placing code within an if (false) block is equivalent to surrounding it with #if 0 and #endif in C. Conditional compilation also works with constants, which, as we saw above, are static final variables.

What is #if in Swift?

Swift if Statement If condition is evaluated to true , the code inside the body of if is executed. If condition is evaluated to false , the code inside the body of if is skipped.

Why we use defer in Swift?

Swift’s defer keyword lets us set up some work to be performed when the current scope exits. For example, you might want to make sure that some temporary resources are cleaned up once a method exits, and defer will make sure that happens no matter how that exit happens.

What does conditional compilation Mean in C programming?

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. The different thing is #if.

How to describe the compilation process in C?

Compilation process in c. 1 Preprocessor. The source code is the code which is written in a text editor and the source code file is given an extension “.c”. This source code is 2 Compiler. 3 Assembler. 4 Linker. 5 Feedback.

What are the directives for conditional compilation in Java?

Six directives are available to control conditional compilation. They delimit blocks of program text that are compiled only if a specified condition is true. These directives can be nested.

What’s the difference between compilation and object code?

The compilation is a process of converting the source code into object code. It is done with the help of the compiler. The compiler checks the source code for the syntactical or structural errors, and if the source code is error-free, then it generates the object code.