2.Write a Program to implement a symbol table.

 

#include<stdio.h>

//#include<conio.h>

#include<malloc.h>

#include<string.h>

#include<math.h>

#include<ctype.h>

void main()

{

int i=0,j=0,x=0,n,flag=0;

void *p,*add[15];

char srch,b[15],d[15],c,ch;

printf("expression terminated by $");

 

while((c=getchar())!='$')

{

b[i]=c;

i++;

}

n=i-1;

 

printf("given expression :");

i=0;

while(i<=n)

{

printf("%c",b[i]);

i++;

}

 

printf("\nsymbol table\n");

printf("symbol\taddr\ttype\n");

 

while(j<=n)

{

c=b[j];

if(isalpha(toascii(c)))

{

   if(j==n)

     {

      p=malloc(c);

      add[x]=p;

      d[x]=c;

      printf("%c\t%d\tidentifier\n",c,p);

 

      }

   else

      {

       ch=b[j+1];

       if(ch=='+'||ch=='*'||ch=='=')

        {

         p=malloc(c);

         add[x]=p;

         d[x]=c;

         printf("%c\t%d\tidentifier\n",c,p);

         x++;

         }

       }

 

}

j++;

}

 

 

printf("the symbol is to be searched\n");

scanf("%s",&srch);

for(i=0;i<=x;i++)

{

if(srch==d[i])

{

printf("symbol found\n");

printf("%c%s%d\n",srch,"@address",add[i]);

flag=1;

}

}

if(flag==0)

printf("symbol not found\n");

}

 OUTPUT: