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Implementing strlen() function in c


Steps:-
      1. read a string from keyboard
      2. pass string to a function as pointer
      3. increment the string pointer and i till it encounters null ('\0') and while fails
      4. return the length to main program

/* C program */

#include<stdio.h>
#include<stdlib.h>
/* program- calculate the lengh of the string (strlen())
Author:- Surendra Patil
Date:- july 11 2013
*/
int str_len(char *);
int main() {
  char *str = NULL;
  /* allocate soutput:-ome memory */
  str = (char*)malloc(20*sizeof(char));
  printf("Enter the string \n");
  scanf("%s",str);
  printf("Length of the string = %d\n",str_len(str));
return 0;
} 

/* Function returns the length of the string */
int str_len (char *string)
{
  int i =0;
  /* increment the pointer till end of the string */
  while(*string++)
   ++i;
  return i;
}

input:-

Enter the string :-
  Surendra

output:-

Length of the string = 8
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Location: San Diego, CA 92126, USA

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