腾讯笔试题--不用变量实现strlen函数

   当时这到题,真的想了好久,大家别鄙视我哈.某次看ds的stack与递归的时候,我靠...递归不就OK了吗^_^不用你们鄙视我,我自己先鄙视下自己.
   

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int count_str (char *);
int
main ()
{
  char *str = (char *) malloc (sizeof (char) * 100);
  printf ("Please input the string you want to count:\n");
  fgets (str, 100, stdin);
  printf ("The length of %s is mycount=%d,strlen=%d\n", str, count_str (str),
     strlen (str));

  return 0;
}

int
count_str (char *string)
{
  if (*string == '\0')
    return 0;
  else
    return (1 + count_str (++string));
}

 gcc -o strlen strlen.c
 ./strlen
 Please input the string you want to count:
 this is a
 The length of this is a
 is mycount=16,strlen=16

看起来都很简单,可是真在那种环境下,还是很白痴的,