program for Hashing search in data structure with example

Program

A complete C program for implementation of a hash table is given here:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SIZE 50
#define MAX 10
 typedef struct node
   {
   char symbol[MAX];
      int value;
      struct node *next;
   } entry;
   typedef entry *entry_ptr;

   int hash_value(char * name)
   {
      int sum=0;
      while( *name != '\0')
      {
         sum += *name;
         name++;
      }
      return(sum % SIZE);
    }
   void initialize( entry_ptr table[])
   {
   int i=0;
    for(i=0; i<SIZE; i++)
        table[i] = NULL;
   }
   void insert( entry_ptr table[], char *name, int val)
   {
      int h, flag = 1;
      entry_ptr temp;
      h = hash_value(name);
      temp = table[h];
      while( temp != NULL && flag )
   {
         if( strcmp(temp->symbol,name) == 0)
           {
         printf("The symbol %s is already present in the
table\n",name);
             flag =0;;
           }
           temp=temp->next;
         }
         if(flag)
         {
         temp = (entry_ptr) malloc(sizeof( entry));
          if(temp == NULL)
   {
               printf("ERRRR .......\n");
               exit(0);
            }
         strcpy(temp->symbol,name);
         temp->value = val;
         temp->next = table[h];
         table[h]=temp;
         }
   }
   void retrieve( entry_ptr table[],char *name)
{
      int h,flag =1;
      entry_ptr temp;
      h = hash_value(name);
      temp = table[h];
      while( temp != NULL && flag)
{
         if( strcmp(temp->symbol,name) == 0)
    {
printf("The symbol %s is present in the table and having value =
%d\n",
   name,temp->value);
                     flag =0;
                  }
             temp=temp->next;
         }
         if(flag == 1)
            printf("The symbol %s is not present in the table
\n",name);
         }
         void main()
         {
          entry_ptr table[SIZE];
          char name[MAX];
          int value,n;
          initialize(table);
          do
          {
          do
{
          printf("Enter the symbol and value pair to be inserted\n");
          scanf("%s %d",name,&value);
          insert(table,name,value);
          printf("Enter 1 to continue\n");
          scanf("%d",&n);
}
while(n == 1);
do
{
          printf("Enter the symbol whose value is to be retrieved\n");
          scanf("%s",name);
          retrieve(table,name);
          printf("Enter 1 to continue\n");
          scanf("%d",&n);
}while( n == 1);
   printf("Eneter 1 to continue\n");
   scanf("%d",&n);
   }while(n == 1);
}