#include <stdio.h>
unsigned long press_events[] = {1, 2, 3 ,4};
 
void print_event_queue() {
     char buff[256], *pos = buff;
     for(int i = 0; i < 127; i++) {
         if(press_events[i]) {                                                                                                                              
             pos += sprintf(pos, " %lu", press_events[i]);
         }
     }
     printf("%s", buff);
 }
 
 
int main(void) {
	print_event_queue();
	return 0;
}

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