Program that uses this DFA and validates whether an entered string is valid integer or not.

Code for Program that uses this DFA and validates whether an entered string is valid integer or not. in C++ Programming

 

 

 

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

int main()
{
    char state = '0';
    char ch = NULL;
    char token[20]={NULL};
    char stt[3][2]= {NULL, '2',
             '0', '1',
             '1', '1'};
    cout<<"Input integer value : ";
    cin>>token;

    for(int i=0; token[i] != NULL; i++)
    {
        if(isdigit(token[i]))
        {
            ch='2';
        }
        else
        {
            printf("Invalide value");
            getchar();
            exit(0);
        }
        for(int j=1; j<3 && ch != stt[0][j]; j++);
        for(int k=1; k<2 && state != stt[k][0]; k++);
        state=stt[k][j];

    }
    printf("Valide value");    
    getchar();
    return 0;
}