#include <stdio.h>
#include <string.h>
int check_email();
int main (char email[], int stringlength)
{
    char email[];
    int stringlength;

    printf("Enter an email address: ");
    scanf("%s", email);

    stringlength=strlen(email);

    if (check_email(email,stringlength)==1)
       printf("\nThis string is a valid email address!\n");
    else
       printf("\nThis string is not a valid email address.\n");

    system("PAUSE");
    return 0;
}

int check_email(char email[], int stringlength)
 {
   int sum=0;
   int i, atindexrecorder;

   for(i=0;i<=stringlength;i++)
    if(email[i]=='@')
     {
     atindexrecorder=i;
     sum++;
     }

   if (sum==1)
    {
     printf("Filter 1: OK\n");

     if(email[0]!='@' && email[stringlength-1]!='@'
       {
         printf("Filter 2: OK\n");
         sum++;
       }
     else
       printf("Filter 2: FAIL\n");

     for(i=atindexrecorder;i<=stringlength;i++)
       if(email[i]=='.')
        {
         sum++;
         printf("Filter 3: OK\n");
         break;
        }
       else
         printf("Filter 3: Fail\n");

     if (



   else
    {
      sum==0;
      printf("Filter 1: Fail\nFilter 2: Fail\nFilter 3: Fail\nFilter 4: Fail\n");