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Symtable.c
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Symtable.c
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//Implementation of Symbol Table//
//Alin Babu,7,R5//
//File name : symtable.c//
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 11 //Maximum size of table//
char l[10];
struct symb //Structure array for storing address and label//
{
int add;
char label[10];
}sy[50];
void search();
int main()
{
int a[50],num,key,i,ch;
char ans;
int create(int);
void lprob(int [],int,int);
void display(int []);
for(i=0;i<MAX;i++)
a[i]=0;
while(1)
{
printf("\n1.Create a symbol table\n2.Search in the symbol table\n3.Exit\nEnter your choice\n");
scanf("%d",&ch);
switch(ch)
{
case 1: printf("\nEnter the address\n");
scanf("%d",&num);
key=create(num);
printf("\nEnter The label\n");
scanf("%s",l);
lprob(a,key,num);
display(a);
break;
case 2: search();
break;
case 3: exit(0);
break;
default: printf("Invalid Option");
}
}
return 0;
}
int create(int num) //Hashing Function to generate key//
{
int key;
key=num%11;
return key;
}
void lprob(int a[MAX],int key,int num) //Insertion of address and label in hash table using linear probing//
{
int flag,i,count=0;
void display(int a[]);
flag=0;
if(a[key]==0)
{
a[key]=num;
sy[key].add=num;
strcpy(sy[key].label,l);
}
else
{
i=0;
while(i<MAX)
{
if(a[i]!=0)
count++;
i++;
}
if(count==MAX)
{
printf("\nHash table is full");
display(a);
exit(1);
}
for(i=key+1;i<MAX;i++)
if(a[i]==0)
{
a[i]=num;
flag=1;
sy[key].add=num;
strcpy(sy[key].label,l);
break;
}
for(i=0;i<key && flag==0;i++)
if(a[i]==0)
{
a[i]=num;
flag=1;
sy[key].add=num;
strcpy(sy[key].label,l);
break;
}
}
}
void display(int a[MAX]) // Function to display the symbol table//
{
int i;
printf("\nThe Symbol Table is");
printf("\nKey\tAddress\tLabel");
for(i=0;i<MAX;i++)
printf("\n%d\t%d\t%s",i,sy[i].add,sy[i].label);
}
void search() // Function to search the symbol table for the label address//
{
char la[10];
int set=0,s;
int j,i;
printf("enter the label: ");
scanf("%s",la);
for(i=0;i<MAX;i++)
{
if(sy[i].add!=0)
{
if(strcmp(sy[i].label,la)==0)
{
set=1;
s=sy[i].add;
}
}
}
if(set==1)
printf("\nThe label --%s-- is present in the symbol table at address:%d\n",la,s);
else
printf("\nThe label is not present in the symbol table\n");
}