Light Turn

#include <stdio.h>
#include <stdlib.h>

typedef enum{
    off, on
} binary;

typedef struct{
    binary denki;
} heya;

void turn(heya *s) {
    if (s->denki == off) s->denki = on;
    else s->denki = off;
}

void suitti(heya *sinsitu)
{
    if (sinsitu->denki == on) {
        printf("点灯\n");
        turn(sinsitu);
    } else {
        printf("消灯\n");
        turn(sinsitu);
    }
}

int main()
{
    heya *sinsitu;
    sinsitu = (heya *) malloc(sizeof(heya));
    sinsitu->denki = on;

    suitti(sinsitu);
    suitti(sinsitu);
    return 0;
}