这是一个保存库存的程序。该程序显示一个选项菜单。除了删除输入功能外，其他一切都很完美。我不知道如何删除它的功能。我把一个变量找到了位置，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，它会陷入无限混乱。有人帮助我如何选择一个项目并从库存中删除它。 它用于Visual Studios 2010，这是代码
#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;
}
答案 0 :(得分：2)
遵循您的编码风格，虽然它应该改进：
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）减少一个。