Write a C program to verify the String 0(0|1)*1

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

          char str[20];

          int i,len;

          clrscr();

          printf("\n Enter the String:-");

          gets(str);

          len=strlen(str)-1;

          if((str[0]=='0' && str[len]=='1'))

                   printf("\n Validddd.....");

          else

                   printf("\n INValid String");

  getch();

}

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Write a C program to verify the string (aa|bb)*

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

          char str[20];

          int flag=0,i;

          clrscr();

          printf("\n Enter the String:-");

          gets(str);

          if(str[0]=='\0'||(str[0]=='a' && str[1]=='a') ||( str[0]=='b' && str[1]=='b'))

          {

                   for(i=2;i<strlen(str);i+=2)

                   {

                             if((str[i]=='a' || str[i+1]=='a'))

                                      flag=1;

                             if((str[i]=='b' || str[i+1]=='b'))

                                      flag=1;

                             else

                             {

                                      flag=0;

                                      goto Next;

                             }

                   }

          Next: if(flag==1)

                             printf("\n Validddd.....");

                   else

                             printf("\n INValid String");

          }

          else

          {

                   printf("\nInvalid");

          }

          getch();

}

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Write a C Program to verify the string ab*

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

            char str[20];

            int flag,i;

            clrscr();

            printf("\n Enter the String:-");

            gets(str);

            if(str[0]=='a')

            {

                        for(i=0;i<strlen(str);i++)

                        {

                                    if(str[i+1]=='b' || str[i+1]=='\0')

                                                flag=1;

                                    else

                                    {

                                                flag=0;

                                                break;

                                    }

                        }

                        if(flag==1)

                                    printf("\nString is Validddd.....");

                        else

                                    printf("\nInvalid String");

            }

            else

            {

                        printf("\nInvalid");

            }

            getch();

}

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