Hey Stefan, this code did compile here for me but I should have had a complete declaration of the function pointers. Try changing all 3 of your function pointer declarations to the following style:

void (*functionptr)(void);

Get rid of the "const" qualifier for all these function pointers as well, they serve no purpose. Your code should look like this.

#define __MAIN_C__
const char mychar1[6]="ABCDEF";
const char *mycharptr;
int mymode;
void xgetstr1(void);
void xgetstr2(void);
typedef struct 
 {int mode;
  void (*funcptr1)(void);
  void (*funcptr2)(void); 
                            
  } myoneset;

void xgetstr1(void){	mycharptr=&mychar1[0];}
void xgetstr2(void){	mycharptr=&mychar1[1];}
  
myoneset listofsets[2] =
 {{1,&xgetstr1,&xgetstr2}, {3,&xgetstr2,&xgetstr1}};
    
int main (void)
{
   void (*myfuncptr)(void);
   int i ;
   mycharptr=&mychar1[0];
   mycharptr=&mychar1[2];			
	 	
   myfuncptr=&xgetstr1;
		
   myfuncptr=listofsets[0].funcptr1; 
   myfuncptr=listofsets[1].funcptr2;
	
   myfuncptr=0;
 
   mymode=2;
   for (i=0;i<2;i++)
   {
      if (listofsets[0].mode==mymode)
         myfuncptr=listofsets[1].funcptr2; 
   } 	
   myfuncptr();   // Call like this
   return(0);
}

Before the return I added the call of the function.