BIT_FLAGS.c

#include <stdio.h>

enum Level{
   OK=1, CANCEL=2, ERROR=4, WARNNING=8
};

int main(void){

   int u_level;
  
   puts("Enter Level (1 for OK, 2 for CANCEL, 4 for ERROR, 8 for WARNNING or a combination): " );
   scanf("%i", &u_level);

   if ((u_level&OK) == OK)
       puts("OK");
   if ((u_level&CANCEL) == CANCEL)
       puts("CANCEL");
   if ((u_level&ERROR) == ERROR)
       puts("ERROR");
   if ((u_level&WARNNING) == WARNNING)
       puts("WARNNING");
  

   return 0;
}