Jan 26, 2012

K & R C Programs Exercise 5-4.

K and R C, Solution to Exercise 5-4:
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, that returns 1 if the string t occurs at the end of the string s, and zero otherwise. Read more about C Programming Language .

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#include <stdio.h>

//finds the string length, standard "strlen" function
int str_len(char *s)
{
 int n;

 for(n = 0; *s != '\0'; s++)
 {
  n++;
 }
 return n;
}

int str_cmp(char *s, char *t)
{
 for(;*s == *t; s++, t++)
  if(*s == '\0')
   return 0;
 return *s - *t;
}


int str_end(char *s, char *t)
{
 int Result = 0;
 int s_length = 0;
 int t_length = 0;

 /* get the lengths of the strings */
 s_length = str_len(s);
 t_length = str_len(t);

 /* check if the lengths mean that the string t could fit at the string s */
 if(t_length <= s_length)
 {
  /* advance the s pointer to where the string t would have to start in string s */
  s += s_length - t_length;

  /* and make the compare using strcmp */
  if(0 == str_cmp(s, t))
  {
   Result = 1;
  }
 }

 return Result;
}
int main(void)
{
 char Str1[8192] ;
 char Str2[8192] ;
 char Str3[8192] ;
 printf("\n Enter the first string: \n");
 scanf("%s",Str1);
 printf("\n Enter the second string: \n");
 scanf("%s",Str2);
 printf("\n Enter the third string: \n");
 scanf("%s",Str3);
 printf("String one is (%s)\n", Str1);
 printf("String two is (%s)\n", Str2);
 printf("String two is (%s)\n", Str3);

 if(str_end(Str1, Str2))
 {
  printf("The string (%s) has (%s) at the end.\n", Str1, Str2);
 }
 else
 {
  printf("The string (%s) doesn't have (%s) at the end.\n", Str1, Str2);
 }
 if(str_end(Str1, Str3))
 {
  printf("The string (%s) has (%s) at the end.\n", Str1, Str3);
 }
 else
 {
  printf("The string (%s) doesn't have (%s) at the end.\n", Str1, Str3);
 }



 return 0;
}


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