#include <stdio.h>
#include <stdlib.h>
 
unsigned long testval = 1234;
 
void* foundit(void)
{
	fputs("found it!\n", stdout);
	return (void*)0;
}
 
void* tryit(void)
{
	unsigned long val;
 
	fputs("enter a value/guess->", stdout);
	fscanf(stdin, "%u", &val);
 
	if (val == testval)
	{
		return (void*)&foundit;
	}
	else
	{
		return (void*)&tryit;
	}
}
 
int main(int argc, char**argv)
{
	void *addr = (void*)&tryit;
 
	//fprintf(stdout, "ans->%u\n", 1);	//remove comments and program runs 
							//but fails to exit with correct value
	while ((addr = ((void*(*)(void))addr)()))
	{}
	exit(EXIT_SUCCESS);
}

//fprintf(stdout, "ans->%u\n", 1);

fprintf(stdout, "ans->%u\n", 1);

#include <stdio.h>
#include <stdlib.h>
 
unsigned long testval = 1234;
 
/*
Define a generic function pointer 
type for temporary conversion
*/
typedef void (*func_t)(void);
 
/*
Define a null value with the 
generic function pointer type
*/
void null_func(void) { }
 
func_t foundit(void)
{
  fputs("found it!\n", stdout);
  return null_function; /* No cast needed */
}
 
func_t tryit(void)
{
  unsigned long val;
 
  fputs("enter a value/guess->", stdout);
 
  /* Note the format specifier. %u was incorrect */
  fscanf(stdin, "%lu", &val);
 
  if (val == testval)
  {
    return (func_t)foundit; /* Safe cast */
  }
  else
  {
    return (func_t)tryit; /* Safe cast */
  }
}
 
int main()
{
  func_t addr = (func_t)tryit; /* Safe cast */
 
  fprintf(stdout, "ans->%u\n", 1U);
 
  while (addr != null_func) {
    /* Cast back to the correct type before calling */
    addr = ((func_t(*)(void))addr)();
  }
 
  /* A call to exit really isn't necessary from main */
  return 0;
}