#include<stdio.h>


/* strlen:  return length of string s
   int strlen(char *s)
   {
       int n;

       for (n = 0; *s != '\0'; s++);
           n++;
       return n;
   }                                  */
/* strlen:  return length of string s   */
   int strlen(char *s)
   {
       char *p = s;

       while (*p != '\0')
           p++;
       return p - s;
   }



/* strcpy:  copy t to s; array subscript version */
   void strcpy(char *s, char *t)
   {
       int i;

       i = 0;
       while ((s[i] = t[i]) != '\0')
           i++;
   }





   /* strcpy:  copy t to s; pointer version
   void strcpy(char *s, char *t)
   {
       int i;

       i = 0;
       while ((*s = *t) != '\0') {
           s++;
           t++;
       }
   }
    */




   /* strcpy:  copy t to s; pointer version 2
   void strcpy(char *s, char *t)
   {
       while ((*s++ = *t++) != '\0')
           ;
   }
*/




   /* strcpy:  copy t to s; pointer version 3
   void strcpy(char *s, char *t)
   {
       while (*s++ = *t++)
           ;
   }
   */

 int strcmp(char *s, char *t)
   {
       int i;

       for (i = 0; s[i] == t[i]; i++)
           if (s[i] == '\0')
               return 0;
       return s[i] - t[i];
   }





   /* strcmp:  return <0 if s<t, 0 if s==t, >0 if s>t
   int strcmp(char *s, char *t)
   {
       for ( ; *s == *t; s++, t++)
           if (*s == '\0')
               return 0;
       return *s - *t;
   }
   */

int main()
{
   printf("Duzina ove niske je : %d\n", strlen("Duzina ove niske je:"));
   printf("%d\n" , strcmp("A prva","C druga"));

  return 0;
}