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what is difference between macro and inine function.?
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what is difference between macro and inine function.?
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Macros are processed by the C/C++ preprocessor before the compilation is performed.

Inline functions are like normal functions, but the compiler will not generate a single block of code that is called each time the function is used. Instead, the compiler inserts the function code whenever the function is used.

An example:
C++
#define DIV_BY_TWO(a)  ((a) >> 1)
inline int DivByTwo(int a) { return a >> 1; }
int DivByFour(int a) { return a >> 2; }

int i = 8;
int j = 0;
// The preprocessor replaces this line by
// j = ((i) >> 1);
// which is then passed to the compiler.
j = DIV_BY_TWO(i);

// The compiler generates code using 
// i >> 1
j = DivByTwo(i);

// The compiler generates a call to the function DivByFour
j = DivByFour(i);
 
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If we talk about c or c++ than macros are the simple codes which are declared with header files and which are fixed like
# macro Pi=3.14;

on the other hand inline functions are the functions which are used to call a function again and again in a class or a specific code body but this functions increases the memory use of programs. Simply a keyword "inline" is used in front of the function to make them a inline function.




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Updated 17-Mar-12 8:24am
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bchandu06 18-Jun-12 13:55pm    
thanks
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