function_pointer.c

struct s_flags
{
   char  flag;
   int   (*p)(int a, int b);
};
typedef struct s_flags t_flags;

t_flags flags[]= {
   {'d', is_d},
   {'i', is_i},
};
 
#define TAB_SIZE(x) (sizeof(x) / sizeof(x[0]))
 
char c = 'i';

while (i < TAB_SIZE(flags))
{
   if (c == flags[i].flag)
      flags[i].p(inta, intb);
   i++;
}