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macro Macros in C refers to the C pre moldor which when runs over the cum statute during compilation feeds its output directly to the input of the existing C compiling program. cpp processes all of the #define, #include, #if, etc. constructs in the program. Macros, specifically, are delineate using the syntax: #define or #define (arg1, arg2, ...) each(prenominal) metre is seen in your source code, cpp replaces it with before being acquittance to the C compiler. A simple archetype: #define pi 3.142 int A,x; A= pi*x*x; When cpp passes the source to the C compiler, it will count on like this: A= 3.142*x*x; a macro proficient replaces each circumstance with the code assigned to it. for example if a macro SQUARE(X) is be to expand to ((X)*(X)) the compiler just replaces e.g. SQUARE(3) with ((3)*(3)) in the program. Macros are in general physical exertiond as straggle of inlining small occasions to save the time of call ing functions . Diff b/w a macros and function 1. a macro returns code 1. a function returns a appreciate 2. macro calls always get spread out once at compile time 2. most function calls are evaluated legion(predicate) many times. 3. the preprocessors job is to expand a macro as its so far about textual matter replacement, not about compiling.

So you dont use time and space doing what a function would direct in order to be executed. 3. When a function is called the compiler enters a call-sequence (which takes time) and allocates some mew memory for that function so that the functions organic structure can be executed. 4. macros only live in the text pre-processing stage of c! ompilation during which they are expanded into code 4. functions are items which exist throughout the whole process of compilation, link and execution. 5. we cant point a pointer to a macro 5. we can use pointers to functions 6. using macros v can change d content of d unsettled 6. the variable would have been out of scope for a function to change it. Dynamic memory...If you want to get a rise essay, order it on our website: OrderEssay.net

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