模拟实现Strlen函数

#include<assert.h>
 int my_strlen(char* arr)
 {
     assert(arr != NULL);
     char* x = arr;
     while (*arr++ != ‘\0‘)
     {
        ;
     }
      return arr - x - 1;
 }

 int main()
 {
   char arr[] = "abcdef";
   int ret = my_strlen(arr);
   printf("%d", ret);return 0;
 }

 1 #include<stdio.h>
 2 #include<assert.h>
 3 
 4 int my_strlen(char* arr)
 5 {
 6   assert(arr != NULL);
 7   if(*arr == ‘\0‘)
 8     return 0;
 9    else
10    return 1 + my_strlen(arr + 1);
11 }
12 
13 
14 int main()
15 {
16     char arr[] = "abcdef";
17     int ret = my_strlen(arr);
18     printf("%d",ret);
19     return 0;  
20 }

#include<stdio.h>
#include<assert.h>

 int my_strlen(char* arr)
 {
   assert(arr != NULL);
   int count = 0;
   while (*arr != ‘\0‘)
   {
      count++;
      arr++;
  }
   return count;
 }

 int main()
 {
   char arr[] = "abcdef";
   int ret = my_strlen(arr);
   printf("%d", ret);
   system("pause");
   return 0;
 }