String Handling in Pointers

String-Handling Functions Using Pointers

Let us see few programs to manipulate strings using pointers.

Example 1:

/* functions to calculate length of a string */

#include <stdio.h>

main()

{

char *ptr, str;

int size=0;

printf ("\n Enter string");

gets(str);

for(ptr=str ; *ptr != '\0' ; ptr ++)

{

size ++;

}

printf ("String length is %d", size);

}

Example 2:

/* function to check for a palindrome */

#include <stdio.h>

main()

{

char str[50], *ptr, *lptr;

printf("\nEnter the string");

gets(str);

for(lptr = str ; *lptr != '\0' ; lptr ++)

/* Reach string terminator */

  lptr --;   /* Position on the last character */

for(ptr = str ; ptr <= lptr ; lptr--, ptr++)

  {

    if (*ptr != *lptr)

      break;

}

if (ptr > lptr)

     printf(" %s is a palindrome");

else

     printf("%s is not a palindrome");

}