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Program to show an example of Hashing

Posted By: Easy Tutor     Category: C++ Programming     Views: 8045

Write a program to show an example of Hashing.

Code for Program to show an example of Hashing in C++ Programming

 # include <iostream.h>
 # include  <fstream.h>
 # include   <string.h>
 # include    <stdio.h>
 # include    <conio.h>


 /**************************************************************************///---------------------------------  Node  -------------------------------///**************************************************************************/class Node
 {
    public:
       char sData[25];

       Node* Next;
 };


 # define MAX_ENTRIES  25

 Node* HashTable[MAX_ENTRIES]={NULL};
 Node* Top[MAX_ENTRIES]={NULL};

 /**************************************************************************///------------------------  generate_hash_key( )  ------------------------///**************************************************************************/constint generate_hash_key(constchar* sData)
 {
    int iHashKey = 0;
    int iLength = strlen(sData);

    int iCode = 0;

    for (int i = 0; i < iLength; i ++)
    iCode += (int)sData[i];

    iHashKey = (iCode%MAX_ENTRIES);

    return iHashKey;
 }

 /**************************************************************************///---------------------------  insert_sData( )  ---------------------------///**************************************************************************/void insert_sData( )
 {
    char sData[25];

    cout<<"\n\n\n\t *********   New Element   ********* "<<endl<<endl;
    cout<<"\t Enter a value : ";
    gets(sData);

    int index=generate_hash_key(sData);

    Node* Entry=new Node;

    if(!Entry)
    {
       cout<<"\n\n\n\t Fatal Error : Unable to allcate memory to stroe new element."<<endl;
       cout<<"\n\n\t\t Pres any key to return to Menu. ";

       getch( );
       return;
    }

    if(HashTable[index]==NULL)
    {
       strcpy(Entry->sData,sData);
       Entry->Next=NULL;
       HashTable[index]=Entry;
       Top[index]=Entry;
    }

    else
    {
       strcpy(Entry->sData,sData);
       Entry->Next=NULL;
       Top[index]->Next=Entry;
       Top[index]=Entry;
    }

    cout<<"\n\n\t\t Pres any key to return to Menu. ";

    getch( );
 }

 /**************************************************************************///----------------------------  print_sData( )  ---------------------------///**************************************************************************/void print_sData( )
 {
    clrscr( );

    cout<<"\n\n\t *****  HashTable & Data  *****\n"<<endl;

    Node* Print;

    for(int index=0;index<MAX_ENTRIES;index++)
    {
       if(index<10)
      cout<<"\t HashTable[0"<<index<<"] : ";

       else
      cout<<"\t HashTable["<<index<<"] : ";

       Print=HashTable[index];

       if(Print!=NULL)
       {
      while(Print!=NULL)
      {
         cout<<Print->sData;

         Print=Print->Next;

         if(Print!=NULL)
        cout<<" , ";
      }

      cout<<endl;
       }

       else
      cout<<"-"<<endl;
    }

    cout<<"\n\n\t\t Pres any key to return to Menu. ";

    getch( );
 }

 /**************************************************************************///----------------------------  search_sData( )  --------------------------///**************************************************************************/void search_sData( )
 {
    char sData[25];

    cout<<"\n\n\n\t *****  Search an Element  *****\n"<<endl;
    cout<<"\t Enter a value : ";
    cin>>sData;

    int flag=0;
    int index=generate_hash_key(sData);

    Node* Print=HashTable[index];

    if(Print!=NULL)
    {
       while(Print!=NULL)
       {
      if(strcmp(Print->sData,sData) == 0)
         flag++;

      Print=Print->Next;
       }

       if(flag)
      cout<<"\n\n\t ***  The Search Element is found "<<flag<<" times.";
    }

    if(!flag)
       cout<<"\n\n\t ***  The Search Element is not found."<<endl;

    cout<<"\n\n\n\t\t Pres any key to return to Menu. ";

    getch( );
 }

 /**************************************************************************///---------------------------  show_working( )  --------------------------///**************************************************************************/void show_working( )
 {
    char Key=NULL;

    do
    {
       clrscr( );

       gotoxy(10,5);
       cout<<"**********   Implementation of Hashing   **********"<<endl;

       gotoxy(10,8);
       cout<<"Select one of the listed operation :"<<endl;

       gotoxy(15,10);
       cout<<"- Press \'I\' to Insert an Element"<<endl;

       gotoxy(15,12);
       cout<<"- Press \'P\' to Print the HashTable & Data"<<endl;

       gotoxy(15,14);
       cout<<"- Press \'S\' to Search an Element"<<endl;

       gotoxy(15,16);
       cout<<"- Press \'E\' to Exit"<<endl;

       Input:

       gotoxy(10,20);
       cout<<"                      ";

       gotoxy(10,20);
       cout<<"Enter your Choice : ";

       Key=getche( );

       if(int(Key)==27 || Key=='e' || Key=='E')
      break;

       elseif(Key=='i' || Key=='I')
      insert_sData( );

       elseif(Key=='p' || Key=='P')
      print_sData( );

       elseif(Key=='s' || Key=='S')
      search_sData( );

       elsegoto Input;
    }
    while(1);
 }


 int main( )
 {
    textmode(C4350);

    show_working( );

    return 0;
 }
  
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Easy Tutor
Easy Tutor author of Program to show an example of Hashing is from United States. Easy Tutor says

Hello Friends,

I am Free Lance Tutor, who helped student in completing their homework.

I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.

I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] com

I have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada.

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Thanks,
Happy Programming :)

 
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