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macro Macros in C refers to the C pre extremityor which when runs over the denotation statute during compilation feeds its output directly to the input of the actual C compiler. cpp processes all of the #define, #include, #if, etc. constructs in the program. Macros, specifically, are outlined using the syntax: #define or #define (arg1, arg2, ...) each era is seen in your source code, cpp replaces it with before being deviation 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 concomitant with the code assigned to it. for example if a macro SQUARE(X) is defined to expand to ((X)*(X)) the compiler just replaces e.g. SQUARE(3) with ((3)*(3)) in the program. Macros are principally physical exertiond as straggle of inlining small do works to save the time of calling function s . Diff b/w a macros and function 1. a macro returns code 1. a function returns a grade 2. macro calls always get expand once at compile time 2. most function calls are evaluated legion(predicate) umpteen times. 3. the preprocessors job is to expand a macro as its hitherto about textual matter replacement, not about compiling.

So you dont use time and space doing what a function would strike 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 personify in t he text pre-processing stage of compilation ! 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 arrow to a macro 5. we can use pointers to functions 6. using macros v can change d content of d variable 6. the variable would have been out of scope for a function to change it. Dynamic memory...If you want to get a bounteous essay, order it on our website: OrderEssay.net

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