C For Macro

Typical COF values are 30 microns for FF and 19 microns for APS-C, while the pixel size for even an 8 MP APS-C DSLR is around 6.5 microns and that for a 12 MP full frame sensor is around 8 microns. Note also that you can't keep on getting more DOF by just stopping down. AF-C will let you get the right thing in focus on your flower. Just put the focus point over the interesting spot and as the wind blows the camera will continually adjust focus. You’ll end up with sharp photos of the subject because you used AF-C for your macro photography. You move & AF-C is for movement.

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The C Preprocessor is not a part of the compiler, but is a separate step in the compilation process. In simple terms, a C Preprocessor is just a text substitution tool and it instructs the compiler to do required pre-processing before the actual compilation. We'll refer to the C Preprocessor as CPP.

All preprocessor commands begin with a hash symbol (#). It must be the first nonblank character, and for readability, a preprocessor directive should begin in the first column. The following section lists down all the important preprocessor directives −

Some examples of Preprocessors −

Analyze the following examples to understand various directives.

This directive tells the CPP to replace instances of MAX_ARRAY_LENGTH with 20. Use #define for constants to increase readability.

These directives tell the CPP to get stdio.h from System Libraries and add the text to the current source file. The next line tells CPP to get myheader.h from the local directory and add the content to the current source file.

It tells the CPP to undefine existing FILE_SIZE and define it as 42.

It tells the CPP to define MESSAGE only if MESSAGE isn't already defined.

It tells the CPP to process the statements enclosed if DEBUG is defined. This is useful if you pass the -DDEBUG flag to the gcc compiler at the time of compilation. This will define DEBUG, so you can turn debugging on and off on the fly during compilation.

Predefined Macros −

ANSI C defines a number of macros. Although each one is available for use in programming, the predefined macros should not be directly modified.

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