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Program of SCANNER

Posted By: Viveka Fischer     Category: C++ Programming     Views: 10503

Write a program of SCANNER.

Code for Program of SCANNER in C++ Programming

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#include<string.h>
#include<iostream.h>
#include<stdlib.h>


int isoperator(char ch)
  {
    if(ch=='+')
        return 1;
    elseif(ch=='-')
        return 2;
    elseif(ch=='*')
        return 3;
    elseif(ch=='/')
        return 4;
    elseif(ch=='=')
        return 5;
    elsereturn 0;
  }

/*int issymbol(int symcounter,char symbol[][10],char currstr[])
{
for(int i=0;i<symcounter;i++)
{
if(strcmp(symbol[i],currstr)==0)
return i;
}
return -1;
}*/
void main() { char instr[50]; char currstr[50]; char symbol[10][10]; int scantab[6][5]={ 1, 2, 3,-1,-1, -1,-1,-1,-1,-1, -1, 2, 2, 2,-1, -1,-1, 3,-1, 4, -1,-1, 5,-1,-1, -1,-1, 5,-1,-1 }; int counter=0,j; int currstate=0,symcounter=0; char currsym; int i=0; int count=0; clrscr(); printf("ENTER THE STRING : "); scanf("%[^\n]",&instr); while(instr[counter]!='\0') { count=0; while(instr[counter++]==' ') {} counter--; while(instr[counter]!=' ' && instr[counter]!='\0') currstr[count++]=instr[counter++]; // printf("%d",count); currstr[count]='\0'; // printf("%s",currstr); currstate=0; int i=0; while(i<strlen(currstr)) { if(isoperator(currstr[i])>0) j=0; elseif(isalpha(currstr[i])) j=1; elseif(isdigit(currstr[i])) j=2; elseif(currstr[i]=='_') j=3; elseif(currstr[i]=='.') j=4; else { printf("ERROR IN INPUT ! PLEASE TRY AGAIN WITH SUITABLE STRING :"); getch(); exit(0); } currstate=scantab[currstate][j]; i++; } if(currstate==1) //printf(" <op,%d>",isoperator(currstr[--i])); printf(" <op> "); elseif(currstate==2) { /* int temp;
temp=issymbol(symcounter,symbol,currstr);
if(temp>=0)
printf(" <id#%d>",temp+1);
else
{
strcpy(symbol[symcounter],currstr);
symcounter++;
printf(" <id#%d>",symcounter);
}*/
printf(" <id> "); } elseif(currstate==3) printf(" <int>"); elseif(currstate==5) printf(" <real>"); elseif(currstate==-1) printf(" error .."); } getch(); }
  
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Viveka Fischer
Viveka Fischer author of Program of SCANNER is from Frankfurt, Germany.
 
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