dev c bilenler acil yardım

#include <stdio.h>
int main()

{

char tur, zaman;
int dk;
float fatura;

printf("tarife turu(h/b/o):");
scanf("%c",&tur);
while ( getchar() != '\n' );

printf("sabah/gece(s/g):");
scanf("%c",&zaman);
while ( getchar() != '\n' );

printf("kac dakika:");
scanf("%d",&dk);

switch(tur)
{
case 'h':
if (zaman == 's') fatura=10+(dk*0.05);
else
if (zaman == 'g') fatura=10+dk*0.03;
else printf("hata");
break;

case 'b':
if (zaman == 's') fatura=12+(dk*0.05);
else
if (zaman == 'g') fatura=12+dk*0.03;
else
printf("hata");
break;

case 'o':
if (zaman == 's') fatura=14+(dk*0.05);
else
if (zaman == 'g') fatura=14+dk*0.03;
else printf("hata");
break;

default: printf("hata");

}

printf("fatura=%.2f\n",fatura);

return 0;
}