#include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4
  5
  6 void print_validity(char * address, terminators, length);
  7
  8 void print_validity(char * address, terminators, length)
  9 {
 10         printf("The string %s is ", address);
 11         if (!isValidEmailAddress(address, terminators, length) printf("not "));
 12
 13
 14                         printf("a valid email address\n");
 15 }
 16
 17
 18                         int main()
 19                         {
 20                         const int length = 5;
 21                         char * terminators[length];
 22                         char * address1, address2;
 23
 24                         terminators[0] = "com";
 25                         terminators[1] = "net";
 26                         terminators[2] = "edu";
 27                         terminators[3] = "ie";
 28                         terminators[4] = "tv";
 29
 30                         address1 = "santa.claus@north.pole.com";
 31                         address2 = "I.am@fish";
 32
 33                         print_validity(address1, terminators, length);
 34                         print_validity(address2, terminators, length);
 35
 36                         return 0;
 37                         }
 38
 39
 40
 41
 42
 43         int isValidEmailAdress(address, terminators, length){
 44         }
 45

 47
 48 int tokenise(char str[], int start, char result[]){
 49           int i=start;
 50           int j=0;
 51
 52           while(str[i]!='@'){
 53
 54                         if(isdigit(str[i])!=0&&isalpha(str[i])!=0&&str[i]!='.'&&str[i]!="_"){
 55                         return 0;
 56 }
 57
 58
 59                   else{
 60                         return 1;
 61                 }
 62
 63
 64                   while(str[i]!=' '){
 65
 66
 67
 68                                   if(str[i]=='\0'){
 69                                           result[j]='\0';
 70                                           return -1;
 71                                 }
 72                                   i++;
 73
 74                   }
 75                   result[j]='\0';
 76                   return i;
 77         }
 78   }
 79