Preprocessor Directives

#define CM_PER_INCH 2.54

• Defines constant macro (or symbolic constant) CM_PER_INCH as 2.54

• Preprocessor replaces each occurrence of CM_PER_INCH in the rest of program to 2.54.

• cm = CM_PER_INCH * inches;

? cm = 2.54 * inches;

• Purpose?

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