#include<stdio.h>
#include<process.h>
#include<string.h>
#include<conio.h>
#include<ctype.h>

int IsOperator(char);

void main()
{
    clrscr();
    char curstr[50],instr[50];
    int count=0,counter=0,i=0,j,k,curstate;
    char 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};

    printf("Enter The String : ");
    scanf("%[^\n]",instr);

//    printf("%d",strlen(instr));while(instr[count]!='\0')
    {
        counter=0;
        while(instr[count++]==' ')
        {
        }
        count--;

        while(instr[count]!=' ' && instr[count]!='\0')
        {
            curstr[counter++]=instr[count++];
//            printf("%c",curstr[counter-1]);

        }
        curstr[counter]='\0';
//        printf("%s",curstr);

        j=0;
        curstate=0;
//        printf("%d",strlen(curstr));\        while(j<strlen(curstr))
        {
            if (IsOperator(curstr[j])>0)
                k=0;
            elseif (isalpha(curstr[j]))
                k=1;
            elseif (isdigit(curstr[j]))
                k=2;
            elseif(curstr[j]=='_')
                k=3;
            elseif(curstr[j]=='.')
                k=4;
            else
            {
                printf("Error In Input...");
                getch();
                exit;
            }

            curstate=scantab[curstate][k];
            //printf("%d",curstate);
            j++;
        }

        if (curstate==1)
            printf(" op ");
        elseif (curstate==2)
            printf(" id ");
        elseif (curstate==3)
            printf(" int ");
        elseif (curstate==5)
            printf(" real ");
        elseif(curstate==-1)
            printf(" error ");
    }
    getch();
}

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;
}