本文介绍了C 中的库存程序.需要有关如何从库存中删除项目的帮助的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是一个保存库存的程序.该程序显示一个选项菜单.除了删除条目功能外，其他一切都完美无缺.我不知道如何让它删除一个函数.我放了一个变量来查找位置，但我真的不知道如何.我输入要删除的项目名称，然后我输入显示条目，它进入无限混乱.有人帮助我如何让它选择一个项目并将其从库存中删除.它在 Visual Studios 2010 中使用，这是代码
This is a program that holds inventory. The program displays a menu of options. Everything else works perfect except the delete an entry function. I do not know how to make it delete a function. I put a variable to find the location but i really have no idea how. I enter the item name to be deleted and then i enter display entry and it goes into an infinite mess. Someone help me on how to make it select an item and delete it from the inventory.It is used in Visual Studios 2010, Here is the code
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define SIZE 25
#define MAX 100
typedef struct {
char item[SIZE]; //item for the company
char company[SIZE]; //company that sells the item
int intStock; //how many of the item are instock
char lastShipDate[SIZE]; //last ship date of that item
double cost; //cost to make the item
double price; //price of the item
} gaming;
//prompts the user to get a selection
int Menu(void);
//display the options to the user
void DisplayOptions(void);
//display some entries for inventory
void HardCodeEntries(gaming entry[],int *size);
//function to add a new entry to the inventory
void AddNewEntry(gaming entry[], int *size);
//function to delete a selected entry from inventory
void Delete(gaming entry[], int *size, int location);
//display the current inventory to screen
void Display(gaming entry[], int size);
//save the current inventory to file
void SaveInventory(gaming br[], int *size);
//clears out the entire inventory
void Clear(int *size);
//load the inventory from the file that is being saved
void LoadSalesRecords(gaming br[], int *size);
//find location of entry that is going to be edited or deleted
int FindLocation(gaming entry[], int size);
//display the options for editing an entry
int EditMenuOptions(void);
//function to edit selected entry
void Edit(gaming entry[], int location);
int main()
{
int selection;
gaming entry [150];
int size=0;
char trash;
int choice;
int location;
//display size of inventory before and after
printf("\nSIZE before: %d", size);
HardCodeEntries(entry, &size);
printf("\nSIZE after: %d\n\n", size);
DisplayOptions();
selection= Menu();
while(selection != 8)
{
if (selection==1)
{
printf("ADD ENTRIES\n\n");
//display size of inventory before adding entries
printf("\nSIZE BEFORE ADDING: %d\n", size);
AddNewEntry(entry, &size);
//display size of inventory after adding entries
printf("\nSIZE AFTER ADDING: %d\n", size);
}
else if(selection==2)
{
printf("DELETE\n\n");
//get location of entry to be deleted
location = FindLocation(entry,size);
printf("\nLOCATION: %d\n", location);
Delete(entry, &size, location);
}
else if(selection==3)
{
printf("EDIT\n\n");
//get the location of entry to be edited
location = FindLocation(entry, size);
printf("\nLOCATION: %d\n", location);
Edit(entry, location);
}
else if(selection==4)
{
printf("DISPLAY OF INVENTORY\n\n");
Display(entry, size);
}
else if(selection==5)
{
printf("SAVING CURRENT INVENTORY TO FILE\n\n");
SaveInventory(entry, &size);
//saves to file
}
else if(selection==6)
{
printf("CLEARING ENTIRE DATA\n\n");
Clear(&size);
}
else if(selection==7)
{
printf("LOADING SALES RECORDS FROM FILE\n\n");
LoadSalesRecords(entry, &size);
}
else
{
printf("COMMAND NOT RECOGNIZED\n\n");
}
printf("\n\n");
DisplayOptions();
//clears buffer
scanf("%c", &trash);
selection = Menu();
}
if (selection==8)
{
printf("\nHAVE A NICE DAY!!!\n\n");
}
return 0;
}
//display the options to the user
void DisplayOptions(void)
{
printf("HELLO, WELCOME TO THE INVENTORY PROGRAM.\n");
printf("THIS PROGRAM HOLDS INVENORY FOR ELECTRONICS COMPANIES ALONG WITH THEIR ITEMS, COST TO PRODUCE, PRICE,\n");
printf("LAST SHIP DATE AND NUMBER IN STOCK\n");
printf("THERE ARE COMPANIES IN THE INVENTORY ALREADY\n");
printf("*********************************************\n\n");
printf("HERE ARE YOUR OPTIONS\n");
printf("1--ADD A NEW ENTRY\n");
printf("2--DELETE AN ENTRY\n");
printf("3--EDIT AN ENTRY\n");
printf("4--DISPLAY THE INVENTORY\n");
printf("5--SAVE CURRENT INVENTORY TO FILE\n");
printf("6--CLEAR THE ENTIRE INVENTORY\n");
printf("7--LOAD SALES RECORD FROM FILE\n");
printf("8--QUIT\n");
}
//prompts the user to get a selection
int Menu(void)
{
int selection;
printf("\nENTER SELECTION: ");
scanf("%d", &selection);
return selection;
}
//display some entries for inventory
void HardCodeEntries(gaming entry[], int *size)
{
strcpy(entry[0].item,"Xbox360");
strcpy(entry[0].lastShipDate,"04/10/12");
entry[0].cost=200.00;
strcpy(entry[0].company,"Microsoft");
entry[0].price=300.0;
entry[0].intStock=150;
*size = *size + 1;
strcpy(entry[1].item,"PlayStation3");
strcpy(entry[1].lastShipDate,"04/10/12");
entry[1].cost=200.00;
strcpy(entry[1].company,"Sony");
entry[1].price=450.00;
entry[1].intStock=100;
*size = *size + 1;
strcpy(entry[2].item,"XboxController");
strcpy(entry[2].lastShipDate,"04/10/12");
entry[2].cost=25.00;
strcpy(entry[2].company,"Microsoft");
entry[2].price=50.00;
entry[2].intStock=50;
*size = *size + 1;
strcpy(entry[3].item,"PS3Controller");
strcpy(entry[3].lastShipDate,"04/10/12");
entry[3].cost=30.00;
strcpy(entry[3].company,"Sony");
entry[3].price=45.00;
entry[3].intStock=50;
*size = *size + 1;
strcpy(entry[4].item,"Wii");
strcpy(entry[4].lastShipDate,"04/10/12");
entry[4].cost=100.00;
strcpy(entry[4].company,"Nintendo");
entry[4].price=200.00;
entry[4].intStock=150;
*size = *size + 1;
}
//function to add a new enty to the inventory
void AddNewEntry(gaming entry[], int *size)
{
printf("\nENTER ITEM:\t\t");
scanf("%s", entry[*size].item);
printf("ENTER SHIP DATE:\t");
scanf("%s", entry[*size].lastShipDate);
printf("ENTER COST TO MAKE:\t\t");
scanf("%lf", &entry[*size].cost);
printf("ENTER COMPANY:\t\t");
scanf("%s", entry[*size].company);
printf("ENTER PRICE:\t\t");
scanf("%lf", &entry[*size].price);
printf("ENTER NUMBER IN STOCK:\t");
scanf("%d", &entry[*size].intStock);
*size = *size + 1;
}
//function to delete a selected entry from inventory
void Delete(gaming entry[], int *size, int location)
{
entry[location] = entry[*size - 1];
*size = *size - 1;
}
//display the current inventory onto the screen
void Display(gaming entry[], int size)
{
int i;
for(i=0; i<size; i++)
{
printf("\n");
printf("ITEM:\t\t %s\n", entry[i].item);
printf("LAST SHIP DATE:\t %s\n", entry[i].lastShipDate);
printf("COST:\t\t %4.2f\n",entry[i].cost);
printf("COMPANY:\t %s\n", entry[i].company);
printf("PRICE:\t\t %4.2f\n", entry[i].price);
printf("IN STOCK:\t %d\n", entry[i].intStock);
}
}
//save the current inventory to a file
void SaveInventory(gaming br[], int *size)
{
FILE *outp;
if((outp = fopen("output.txt","w"))==0)
{
printf("\nCANNOT OPEN FILE\n");
return;
}
//connect to the file
outp= fopen("output.txt","w");
fprintf(outp,"%d", *size);
fwrite(br, sizeof(gaming),*size,outp);
//close file pointer
fclose(outp);
}
//clears out the entire inventory
void Clear(int *size)
{
*size = 0;
}
//load the inventory from the file that is being saved
void LoadSalesRecords(gaming br[], int *size)
{
FILE * inp;
if((inp = fopen("output.txt","r"))==0)
{
printf("CANNOT OPEN FILE\n");
return;
}
//connect to file
inp = fopen("output.txt","r");
fscanf(inp,"%d",size);
fread(br, sizeof(gaming),*size,inp);
//close file pointer
fclose(inp);
}
//find location of entry that is going to be edited or deleted
int FindLocation(gaming entry[], int size)
{
int i;
int j;
int length;
char userItem[SIZE];
//enter the item to delete
printf("ENTER ITEM TO EDIT OR DELETE: ");
scanf("%s", userItem);
length = strlen(userItem);
for(i=0; i<length; i++)
{
userItem[i] = toupper(userItem[i]);
}
printf("\nYOUR BRAND IN UPPER CASE IS: %s\n", userItem);
for(j=0; j<size; j++)
{
if(strcmp(entry[j].item,userItem)==0)
{
return j;
}
}
return -1;
}
//function to edit a selected entry
void Edit(gaming entry[], int location)
{
int choice;
choice = EditMenuOptions();
if(choice==1)
{
printf("\nENTER NEW ITEM: ");
scanf("%s", &entry[location].item);
}
else if(choice==2)
{
printf("\nENTER SHIP DATE: ");
scanf("%s", &entry[location].lastShipDate);
}
else if(choice==3)
{
printf("\nENTER COST TO MAKE: ");
scanf("%lf", &entry[location].cost);
}
else if(choice==4)
{
printf("\nENTER COMPANY: ");
scanf("%s", &entry[location].company);
}
else if (choice==5)
{
printf("\nENTER PRICE: ");
scanf("%lf", &entry[location].price);
}
else if (choice==6)
{
printf("\nENTER HOW MANY IN STOCK: ");
scanf("%d", &entry[location].intStock);
}
else if (choice==7)
{
printf("\nENTER NEW ITEM: ");
scanf("%s", &entry[location].item);
printf("\nENTER SHIP DATE: ");
scanf("%s", &entry[location].lastShipDate);
printf("\nENTER COST TO MAKE: ");
scanf("%lf", &entry[location].cost);
printf("\nENTER COMPANY: ");
scanf("%s", &entry[location].company);
printf("\nENTER PRICE: ");
scanf("%lf", &entry[location].price);
printf("\nENTER HOW MANY IN STOCK: ");
scanf("%d", &entry[location].intStock);
}
else
{
printf("Invalid Entry");
}
}
//display the options for edditing an entry
int EditMenuOptions(void)
{
int choice;
printf("\nENTER 1 TO EDIT ITEM\n");
printf("ENTER 2 TO EDIT DATE\n");
printf("ENTER 3 TO EDIT COST\n");
printf("ENTER 4 TO EDIT COMPANY\n");
printf("ENTER 5 TO EDIT PRICE\n");
printf("ENTER 6 TO EDIT NUMBERS IN STOCK\n");
printf("ENTER 7 TO EDIT ALL DATA\n");
printf("\nENTER SELECTION: ");
scanf("%d", &choice);
return choice;
}
推荐答案
遵循您的编码风格，尽管应该改进:
Following your coding style, although it should improve:
void remove_item(gaming entry[], int *size, int item) {
memcpy(&entry[item], &entry[*size], sizeof(entry[0]));
*size = *size - 1;
}
此代码将覆盖所需的条目(在索引 item 处)并将最后一个索引(size)减一.
This code will override the desired entry (at index item) and decrease the last index (size) by one.
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