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Question :

How can type-insensitive macros be created?

Answer :

A type-insensitive macro is a macro that performs the same basic operation on different data types. This task can be accomplished by using the concatenation operator to create a call to a type-sensitive function based on the parameter passed to the macro. The following program provides an example: #include <stdio.h> #define SORT(data_type) sort_ ## data_type void sort_int(int** i); void sort_long(long** l); void sort_float(float** f); void sort_string(char** s); void main(void); void main(void) { int** ip; long** lp; float** fp; char** cp; ... sort(int)(ip); sort(long)(lp); sort(float)(fp); sort(char)(cp); ... } This program contains four functions to sort four different data types: int, long, float, and string (notice that only the function prototypes are included for brevity). A macro named SORT was created to take the data type passed to the macro and combine it with the sort_ string to form a valid function call that is appropriate for the data type being sorted. Thus, the string sort(int)(ip); translates into sort_int(ip); after being run through the preprocessor. © CoolInterview.com Today's Special: Get Free Magazine from SAP now! A D V E R T I S E M E N T

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Category	C Interview Questions
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