01/10/2018, 15:26

Cách gọi tên một chương trình con trong lệnh switch

Mong mọi người giúp đỡ ạ! Em cảm ơn
Sau đây là code:

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#include<limits.h>
#include <iostream>
#define MAX_SIZE 255
//dinh nghia cau truc mat hang
typedef struct mathang {
	char tenhang[MAX_SIZE];
	int gia;
	int soluong;
	struct mathang* next;
}mathang_t;
typedef  
mathang_t* mathang_ptr;
mathang_ptr create_mathang(char* tenhang_, int gia_, int soluong_) {
	mathang_ptr mathang = (mathang_ptr)malloc(sizeof(mathang_t));
	strcpy(mathang->tenhang, tenhang_);
	mathang->gia = gia_;
	mathang->soluong = soluong_;
	mathang->next = NULL;
	return mathang;
}
mathang_t* enter() {
	int soluong, gia;
	char kq1;
	char tenhang[MAX_SIZE];
	system("cls");
	printf("chon mat hang moi
");
	while(getchar()!= '
');
	printf ("ten cua mat hang 
");
	gets(tenhang);
	printf("gia:");
	scanf("%d", &gia);
	printf("so luong:");
	scanf ("%d", &soluong);
	return create_mathang(tenhang, gia, soluong);
}
void in(mathang_ptr dau){
	mathang_ptr p=dau;
	while(p){
		printf(" %20s 	 %10d 	 %8d 
",p->tenhang, p->gia, p->soluong);
		p=p->next;
	}
}
void them_dau(mathang_ptr *dau, mathang_ptr no){
	if(*dau){
		no->next=*dau;
		*dau=no;
	}
	else{
		*dau=no;
	}
}
void them_duoi (mathang_ptr* dau, mathang_ptr no){
	if(*dau){
		mathang_t *p=*dau;
		while(p->next){
			p=p->next;
		}
		p->next=no;
	}
	else{
		*dau=no;
	}
}
void chen(mathang_ptr* dau, mathang_ptr no, int k){
	if(k<=0){
		them_dau(dau,no);
	}
	else{
		if(*dau){
			mathang_t *p=*dau;
			int i=1;
			while(p->next && i<k){
				p=p->next;
				i++;
			}
		no->next=p->next;
		p->next=no;		
			}
			else{
				*dau=no;
			}
	}
}
void remove_dau(mathang_ptr* dau){
	mathang_ptr p=*dau;
	if (p){
		*dau=p->next;
		free(p);
		p=NULL;
}
}
void remove_duoi(mathang_ptr* dau){
	mathang_ptr p=*dau;
	if(p){
		if (p->next ==NULL)
		{
			free(p);
			p=NULL;
			*dau=NULL;
		}
		else{
			mathang_ptr r=p->next;
			while(r->next){
				p=r;
				r=r->next;
			}
			free(r);
			r=NULL;
			p->next=NULL;
		}
	}
}
int menu(){
	system("cls");
	printf("1. Nhap mat hang moi
");
	printf("2. In tat ca cac mat hang
");
	printf("3. Chen vao dau mot mat hang moi
");
	printf("4. Chen vao duoi mot mat hang moi
");
	printf("5. Chen vao mot mat hang moi o k
");
	printf("6. Dem mat hang co gia lon hon x
");
	printf("7. Tro ve mat hang dau
");
	printf("8. Tro ve mat hang duoi
");
	printf("9. Tim san pham bang code
");
	printf("0. Thoat
");
	printf("Chon so cua ban:");
	int luachon;
	scanf ("%d", &luachon);
	return luachon;
}
int main()
{
	char tenhang;
	int tl, gia, soluong;
	mathang_t mathang;
	menu:;
	tl= menu();
	switch (tl)
	{
		case 1:
			*enter();
			break;
		case 2:
			mathang = *enter();
			in(mathang);
			break;
	}
    		
	goto menu;	
	getch();
	return 0;
}