// ----------------------------------------------------------

#include <stdio.h>

struct buying_item {
  char name[16];
  int price;
  int kind;
} ;

void input_buying_item(struct buying_item *item)
{
  printf("Name?: ");
  scanf("%s",&item->name);

  printf("Price?: ");
  scanf("%d",&item->price);

  printf("Kind? (0:f,1:c,2:o): ");
  scanf("%d",&item->kind);
}

void print_kind_buying_item(int kind)
{
	 switch(kind){
  case 0:
	  printf("Food");
	  break;
  case 1:
	  printf("Clothing");
	  break;
  case 2:
	  printf("Other");
	  break;
  }
  printf("\n");
}

void output_buying_item(struct buying_item item)
{
  printf("Name : %s\n",item.name);
  printf("Price: %d\n",item.price);
  printf("Kind : ");
  print_kind_buying_item(item.kind);	
}

void output_buying_item2(struct buying_item item)
{
  printf("Name : %s\n",item.name);
  printf("Price: %d\n",item.price);
}

int total_price_biying_item(struct buying_item *item,int num,int kind)
{
  int i;
  int total=0;
  for(i=0;i<num;i++)
	  if(item[i].kind==kind)
		total = total + item[i].price;
	return total;
}

void main()
{
  struct buying_item item[3];
  int i,j;

  for(i=0;i<3;i++)
    input_buying_item(&item[i]);
 
	  for(i=0;i<3;i++){
		  print_kind_buying_item(i);
		  for(j=0;j<3;j++)
			if(i==item[j].kind)
			  output_buying_item2(item[j]);
	  }

	  for(i=0;i<3;i++){
		  printf(" : %d\n",total_price_biying_item(item,3,i));
		  for(j=0;j<3;j++)
			if(i==item[j].kind)
			  output_buying_item2(item[j]);
	  }

	  printf("\n");
}
    
// ----------------------------------------------------------

#include <stdio.h>

#include <io.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

void main()
{
	int fd,re;
	char fname[128];
	char ch;
//	int i;

	printf("Input Filename: ");
	gets(fname);

	fd=open(fname,O_RDONLY);
	if(fd== -1){
		printf("%s No such file\n");
		return;
	}

	while(1){
		re=read(fd,&ch,1);
		if(re==0)
			break;
		printf("%c",ch);
	}

	close(fd);
}

// ----------------------------------------------------------

#include <stdio.h>

#include <io.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

void main()
{
	int fd,re;
	char fname[128];
	char ch;

	printf("Input Filename: ");
	gets(fname);

	fd=open(fname,O_WRONLY);
	if(fd== -1){
		printf("%s No such file\n");
		return;
	}

	while(1){
		ch=getchar();
		if(ch==EOF)
			break;
		re=write(fd,&ch,1);
	}

	close(fd);
}