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#include <stdio.h>
#include <stdlib.h>
void say1(void)
{
printf("hello, world!\n");
}
void say2(void)
{
printf("hello bro!\n");
}
/* quite silly function, it is better to return an int and modify a parameter */
void (*swap_say( void (*current_say)(void) )) (void)
{
if (!current_say)
return NULL;
void (*ret)(void) = NULL;
if (current_say == &say1)
ret = say2;
else
ret = say1;
return ret;
}
int main(int argc, char **argv)
{
void (*say_fptr)(void) = say1;
say_fptr();
/* now modfiy the above func ptr */
say_fptr = swap_say(say_fptr);
say_fptr();
return 0;
}
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