INTERVIEW QUESTIONS C FUNCTIONS IN C DETAILS

Question: How do you use a pointer to a function?

Answer: The hardest part about using a pointer-to-function is declaring it.

Consider an example. You want to create a pointer, pf, that points to the strcmp() function.

The strcmp() function is declared in this way:

int strcmp(const char *, const char * )

To set up pf to point to the strcmp() function, you want a declaration that looks just like the strcmp() function’s declaration, but that has *pf rather than strcmp:

int (*pf)( const char *, const char * );

After you’ve gotten the declaration of pf, you can #include <string.h> and assign the address of strcmp() to pf: pf = strcmp;

The hardest part about using a pointer-to-function is declaring it.

Consider an example. You want to create a pointer, pf, that points to the strcmp() function.

The strcmp() function is declared in this way:

int strcmp(const char *, const char * )

To set up pf to point to the strcmp() function, you want a declaration that looks just like the strcmp() function’s declaration, but that has *pf rather than strcmp:

int (*pf)( const char *, const char * );

After you’ve gotten the declaration of pf, you can #include <string.h> and assign the address of strcmp() to pf: pf = strcmp; Source: CoolInterview.com

#include<stdio.h>
#include<string.h>
int (*pf)( const char *, const char * );

int main()
{
pf = strcmp;
printf("%d",pf("baseer","asdf"));
getch();
}

Here is how it should be called.
printf("%d",pf("baseer","asdf"));

%d displays the return value
Source: CoolInterview.com

calling function :
sample(&d)

called function :

void sample(*d)
Source: CoolInterview.com

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