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

//More about that some said don't use strcpy() but use strncpy()!!!
int main () {
   char str1[128];
   char str2[256];
   int len1, len2;
   len1=strlen("this is string1");
   len2=strlen("That is test string2");
   printf("Length of str1[128]: %d\n", len1);
   printf("Length of str2[256]: %d\n\n", len2);

   strcpy(str1, "this is string1");
   strcpy(str2, "That is test string2");

   printf("Length of strlen(str1): %lu\n", strlen(str1));
   printf("Length of strlen(str2): %lu\n\n", strlen(str2));

/*Start of block One***********************/
   memset(str1, 'X', strlen(str1)+113); // fills the first 128 bytes of the memory area pointed to by str1 with the constant byte 'X'.
   memset(str2, 'X', strlen(str2)+108); // fills the first 128 bytes of the memory area pointed to by str2 with the constant byte 'X'.

   strncpy(str1, "this is string1", len1);
   strncpy(str2, "That is test string2", len2);
   puts("___Line 1___:");
   puts(str1);
   puts("___Line 2___:");
   puts(str2);
   printf("------------------------------------------------------------------\n");
/*End of block One***********************/

/*Start of block Two***********************/
   memset(str1, 'X', strlen(str1)+113); //fills the first 128 bytes of the memory area pointed to by str1 with the constant byte 'X'.
   memset(str2, 'X', strlen(str2)+108); //fills the first 128 bytes of the memory area pointed to by str2 with the constant byte 'X'.
   strcpy(str1, "this is string1");
   strcpy(str2, "That is test string2");

   puts("___Line 1___:");
   puts(str1);
   puts("___Line 2___:");
   puts(str2);
   printf("------------------------------------------------------------------\n");
/*End of block Two***********************/
   return(0);
}