Deletion

In case "6" i need a code to delete a book record

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 #include<iostream>
#include <windows.h>
#include<conio.h>
#include<cstring>
#include<string>
#define SIZE 20

using namespace std;
 
struct Books
{
    
	int book_number;
    char title[50];
    char author[50];
    char subject[100];
    int book_id;
}Book[SIZE],Book_2[SIZE],temporary;
 
void Display_Title()
{
    cout<<"\n\t\t\tBook Record\n";
    system("Color F6");
}
 
void Input_Record(struct Books Book[],int Number_of_Records,int x)
{
    int y,z=0,checker;
               
    for(x=1;x<=Number_of_Records;x++)
    {
        z++;
        Book[x].book_number=z;
        cout<<"\n\tBook "<<Book[x].book_number<<"\n";
        cout<<"\n\t\tTitle: ";
        cin.getline(Book[x].title,50);
        cout<<"\n\t\tAuthor: ";
        cin.getline(Book[x].author,50);
        cout<<"\n\t\tSubject: ";
        cin.getline(Book[x].subject,100);
        do
        {
        	checker=0;
        	cout<<"\n\t\tID: ";
        	Book_ID:
        	cin>>Book[x].book_id;cin.ignore();
        	if(Book[x].book_id<0)
        	{
        		cout<<"\n\t\tInvalid Input.\n";
        		checker=1;
			}
        	for(y=1;y<=5;y++)
            	if(Book[x].book_id==Book[y].book_id)
                	if(y!=x)
                	{
                		cout<<"\n\t\tDuplicate Detected,Enter Another\n";
                		checker=1;
					}
		}while(checker==1);
	}
}
 
void Backup_Copy(struct Books Book[],int x)
{
    for(x=0;x<SIZE;x++)
    Book_2[x]=Book[x];
}
 
bool Search_Record(int x,int Search_Book_ID)
{
    for(x=1;x<=SIZE;x++)
    if(Search_Book_ID==Book[x].book_id)
 
    return 1;
    return 0;
}
 
void Display_Search_Record(int x,int Search_Book_ID)
{
    for(x=1;x<=SIZE;x++)
    {
        if(Search_Book_ID==Book[x].book_id)
        {
            system("Color F6");
			cout<<"\n\n\tTitle \t\tAuthor \t\tSubject \t\tID";
            cout<<"\n\nBOOK "<<x;
            cout<<"\t"<<Book[x].title;
            cout<<"\t"<<Book[x].author;
            cout<<"\t"<<Book[x].subject;
            cout<<"\t"<<Book[x].book_id;
        }
    }
}
 
void Search_Validation(int Search_Book_ID)
{
    int x, Result;
    if(Search_Record(x,Search_Book_ID)==1)
    {
      system("Color F6");
	    Display_Search_Record(x,Search_Book_ID);
        cout<<"\n\nTHE BOOK ID "<<Search_Book_ID<<" IS IN THE RECORDS!";
    }
    else
    cout<<"\nTHE BOOK ID "<<Search_Book_ID<<" IS NOT IN THE RECORDS!";
}
 
void Sort_Record(struct Books Book[],int x,int Number_of_Records)
{
    int y;
               
    for (x=Number_of_Records-1;x>0;x--)
    for(y=0;y<=x;y++)
		if (Book_2[y].book_id>Book_2[y+1].book_id)
        {
            temporary=Book_2[y];
            Book_2[y]=Book_2[y+1];
            Book_2[y+1]=temporary;
        }
}
 
void Display_Sorted_Record(struct Books Book[],int x,int Number_of_Records,int z)
{
    for(x=1;x<=Number_of_Records;x++)
    {
        cout<<"\n\nBOOK "<<Book_2[x].book_number;
        cout<<"\t"<<Book_2[x].title;
        cout<<"\t"<<Book_2[x].author;
        cout<<"\t"<<Book_2[x].subject;
        cout<<"\t"<<Book_2[x].book_id;
    }              
}
 
void Display_Original_Record(struct Books Book[],int x,int Number_of_Records,int z)
{
    for(x=1;x<=Number_of_Records;x++)
    {
        cout<<"\n\nBOOK "<<Book[x].book_number;
        cout<<"\t"<<Book[x].title;
        cout<<"\t"<<Book[x].author;
        cout<<"\t"<<Book[x].subject;
        cout<<"\t"<<Book[x].book_id;
    }
}
 
int main(void)
{
    int x,y,z,Number_of_Records,Search_Book_ID,Result,test=0;
    char choice,choice_2,cho,Y,N;
 
    Display_Title();
    cout<<"\n\tEnter your desire Number of Book Record's: ";
    cin>>Number_of_Records;cin.ignore();
               
    cout<<"\n\t Enter "<<Number_of_Records<<" Book Record's: \n";
    Input_Record(Book,Number_of_Records,x);
               
    do{
        MENU:
        system("cls");
        Display_Title();
        cout<<"\n Choose the operation to be use in the Record:";
        cout<<"\n[1]-Make a Backup Copy";
        cout<<"\n[2]-Search a Record";
        cout<<"\n[3]-Sort Record";
        cout<<"\n[4]-Display Sorted Record";
        cout<<"\n[5]-Display Original File Record";
        cout<<"\n[6]-Deletion";
		cout<<"\n[E]-Exit\n";
        cout<<"Please input your choice here: ";
        cin>>choice;
        choice=toupper(choice);
          system("Color F6");                     
        system("cls");
        switch(choice)
        {
            case '1':
            {
                Display_Title();
                test=1;
                cout<<"\nMake a Backup Copy:\n";
                Backup_Copy(Book,x);
        	     cout << "Back Up copy initializing,Please Wait" << endl;
				 Sleep( 2000 );
				cout<<"\nBack Up Is Successfull.";	
                 Sleep(4000);
				cout<<"\n\nPress [ENTER] to choose another operation.";
                break;
        	}
            
			case '2':
            {
                Display_Title();
                cout<<"\nSearch a Record:\n";
                cout<<"\nInput the Book you want to search: ";
                cin>>Search_Book_ID;
                           
                Result=Search_Record(x,Search_Book_ID);
                Search_Validation(Search_Book_ID);
                               
                cout<<"\n\nPress [ENTER] to choose another operation.";
                break;
            }
                                               
            case '3':
            {
                Display_Title();
                if(test==1)
                {
                    cout<<"\nSort Record:\n";
                    Sort_Record(Book,x,Number_of_Records);
                    cout<<"Initializing Sorting,Please Wait";
                     Sleep( 2000 );
					cout<<"\nSorting Successfull!";
                     Sleep(4000);
				    cout<<"\n\nPress [ENTER] to choose another operation.";
 				}
 				else
				{
					cout<<"\nMake a Back Up First!";
					cout<<"\nPRESS [ENTER] TO RETURN IN THE MENU!!!";
				}
				break;
			}
               
			case '4':
			{
                Display_Title();
                if(test!=1)
				cout<<"\nSort First!";
                else
                {
                    cout<<"\nDisplay Sorted Record:";
                    Display_Sorted_Record(Book,x,Number_of_Records,z);
                    cout<<"\n\nPress <ENTER> to choose another operation.";
                }
                break;
            }
                                              
            case '5':
            {
            	Display_Title();
           	    cout<<"\nDisplay Original File Record:";
                Display_Original_Record(Book,x,Number_of_Records,z);
                cout<<"\n\nPress <ENTER> to choose another operation.";
                break;
            }
                                               
            	case '6':
            {
                cout<<"Are you sure you want to delete this array? Y/N"<<endl;
                cin>>cho;
                
         
        	
                break;
            }
			
			
			case 'E':
            {
                cout<<"This is the end of the program.";
            	exit(0);
                break;
            }
                                               
            default:
            {
                cout<<"Invalid Input Try Again!";
                break;
            }
    	}
        
        getch();
        
    }while(choice_2!='E');
}
Deleting a book is easy if you use a std::vector for books.

If you're using an array, you have to move all the following elements to fill the space occupied by the book you're deleting.

One comment on your naming. Your struct represents one book, yet you name it Books.
Your arrays represent multiple book, but you name them Book and Book_2. Seems backward to me.
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