#include <stdio.h>
#include <string.h>

int main(void)
{
   char s0[] = "abcdefghijklmnopqrstuvwxyz";
   char s1[30] = "string 1";
   char s2[] = "another string";
   int l1, l2;
   printf("S0: %s\nS1: %s\nS2: %s\n", s0, s1, s2);

   printf("\n-----\nPrint the length of the string\n");
   //Print the length of the string
   printf("Length - s1: %d  s2: %d\n", l1 = strlen(s1), l2 = strlen(s2));

   printf("\n-----\nConcatenate two strings and print the result\n");
   //Concatenate two strings and print the result
   printf("Concatenated: %s\n", strcat(s1,s2));


   printf("\n-----\nCompare two strings and copy the lesser to the greater\n");
   //Compare two strings and copy the lesser to the greater
   printf("S0: %s\nS1: %s\nS2: %s\n", s0, s1, s2);
   if (strcmp(s1, s2) < 0) {
      printf("s1 less than s2\n");
      strcpy(s2, s1);
   }
   else if (strcmp(s1,s2) > 0) { 
      printf("s2 less than s1\n");
      strcpy(s1, s2);
   }
   printf("S0: %s\nS1: %s\nS2: %s\n", s0, s1, s2);

   printf("\n-----\nCount the occurrences of '?'\n");
   //Find how many times the character '?' occurs in a string
   char  s3[] = "a.b?c.d?e.";
   char *p = strchr(s3, '?');
   int count = 0;
   while (p != NULL) {
      count++;
      p = strchr(p + 1, '?');
   }
   printf("Count: %d\n", count);

   printf("\n-----\nFind the tokens in the string\n");
   //Find the tokens in a string, print one by one
   char s4[] = "there are seven tokens in this string";
   char *pt = strtok(s4, " ");
   while (pt != NULL) {
      printf("%s\n", pt);
      pt = strtok(NULL, " ");
   }
   return 0;
}