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在我的程序中，我計劃篩選用戶的選項以獲取庫存的特定數據。 例如，在程序開始時，會出現菜單讓用戶選擇添加或刪除數據，然後例如如果他們說插入，然後我會給他們選擇一家汽車公司（如豐田或本田）的選項和一旦他們選擇了那家公司，我會給他們選擇他們可以在庫存中添加的所有豐田車型。這將會發生，所以我可以縮小範圍並對我提供的信息進行選定的操作。如何根據我的計劃的具體選擇給出選擇？
事情是我不知道如何過濾掉某個特定公司的模型。我已經創建了包含不同模型的不同數組，但我不知道如何顯示該公司模型的用戶選項。
這裏是我的代碼..
#include <stdio.h>
#include <stdlib.h>
#define MAX_WORD_LENGTH 20
#define MAX_SIZE 100
typedef struct cardata{
char carname[MAX_WORD_LENGTH];
char carmodel[MAX_WORD_LENGTH];
char caryear[MAX_WORD_LENGTH];
char cartype[MAX_WORD_LENGTH];
int quantity;
}CarData;
struct node{
CarData data;
struct node *next;
struct node *prev;
}*start=NULL;
const char *companyList[10] = {"Toyota", "Honda","Hyundai","Nissan","Mitsubishi","VoksWagon","Acura","Ford","Dodge","GMC"};
const char *companyModels[10] = {toyotaModels,hondamodels,hyundaimodels,nissanmodels,mitsubishimodels,vokswagonmodels,acuramodels,fordmodels,dodgemodels,gmcmodels};
const char *toyotaModels[10]={"Corolla","Camery"}
const char *hondaModels[10]={"Civic","Accord"};
void insert_first(){
struct node *ptr;
char carname[MAX_WORD_LENGTH];
char carmodel[MAX_WORD_LENGTH];
char caryear[MAX_WORD_LENGTH];
char cartype[MAX_WORD_LENGTH];
int carQuantity;
int ch;
printf("\n\n\n1.Toyota \n2.Honda \n3.Hyundai \n4.Nissan \n5.Mitsubishi \n6.Volksvagon \n7.Acura \n8.Ford \n9.Dodge \n10.GMC\n");
printf("\nPress a number to select corresponding car(i.e. 1 for toyota, 2 for honda): ");
scanf("%d", &ch);
strcpy(carname,companyList[ch-1]);
printf("\n\nEnter the car model: ");
scanf("%s", carmodel);
printf("\n\nEnter the car year: ");
scanf("%s", caryear);
printf("\n\nEnter the car type: ");
scanf("%s", cartype);
printf("\n\nEnter the quantity of models: ");
scanf("%d", &carQuantity);
if(start==NULL){
start=(struct node *)malloc(sizeof(struct node));
strcpy(start->data.carname,carname);
strcpy(start->data.carmodel,carmodel);
strcpy(start->data.caryear,caryear);
strcpy(start->data.cartype,cartype);
start->data.quantity=carQuantity;
start->prev=NULL;
start->next=NULL;
}else{
ptr=start;
start=(struct node *)malloc(sizeof(struct node));
strcpy(start->data.carname,carname);
strcpy(start->data.carmodel,carmodel);
strcpy(start->data.caryear,caryear);
strcpy(start->data.cartype,cartype);
start->data.quantity=carQuantity;
start->next=ptr;
}
}
void delete_first(){
struct node *ptr;
char carname[MAX_WORD_LENGTH];
char carmodel[MAX_WORD_LENGTH];
char caryear[MAX_WORD_LENGTH];
char cartype[MAX_WORD_LENGTH];
char modelNumber[MAX_WORD_LENGTH];
int carQuantity;
if(start==NULL){
printf("\n\nLinked list is empty.\n");
}else{
ptr=start;
printf("\nThe car for which the entry is removed is %s \n",ptr->data.carname);
strcpy(start->data.carname,carname);
strcpy(start->data.carmodel,carmodel);
strcpy(start->data.caryear,caryear);
strcpy(start->data.cartype,cartype);
start->data.quantity=carQuantity;
start=start->next;
free(ptr);
}
}
void display()
{
struct node *ptr=start;
int i=1;
if(ptr == NULL){
printf("\nLinklist is empty.\n");
}else{
printf("\nSr. No Make Model Year Type Quantity\n");
while(ptr != NULL){
printf("\n%d.\t%s %s %s %s %d\n", i,ptr->data.carname,ptr->data.carmodel,ptr->data.caryear,ptr->data.cartype,ptr->data.quantity);
ptr = ptr->next;
i++;
}
}
}
int main(void)
{
int ch;
do
{
printf("\n\n\n1. Insert \n2. Delete \n3. Display \n4. Exit\n");
printf("\nEnter your choice: ");
scanf("%d", &ch);
switch(ch)
{
case 1:
insert_first();
break;
case 2:
delete_first();
break;
case 3:
display();
break;
case 4:
exit(0);
default:
printf("\n\nInvalid choice. Please try again. \n");
}
} while(1);
return 0;
}