Jan 26, 2012

K & R C Programs Exercise 5-5.

K and R C, Solution to Exercise 5-5:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to write the versions of the library functions strncpy, strncat, and strncmp, which operate on at most the first n characters of their argument strings.
For example, strncpy(s, t, n) copies at most n characters of t to s. Read more about C Programming Language .

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/*strncpy: copy n characters from t to s*/
void strncpy(char *s, char *t, int n)
{
 while(*t && n--> 0)
  *s++ = *t++;
 while( n--> 0)
  *s++ = '\0';
}

/*strncat: concatenate n characters of t to end of s*/
void strncat(char *s, char *t, int n)
{
 void strncpy(char *s, char *t, int n);
 int strlen(char *);
 strncpy(s+strlen(s), t, n);
}

/*strncmp: comapre at most n characters of t with s */
int strncmp(char *s, char *t, int n)
{
 for( ; *s == *t; s++, t++)
  if(*s == '\0' || --n <= 0)
  {
   return 0;
  }
 return *s - *t;
}
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