C语言实现strlen函数和字符串遍历

strlen实现:

1 int my_strlen(char *str)
2 {
3     char *tmp = str;
4     while (*str)
5     {
6         str++;
7     }
8     return str - tmp;

字符串遍历:

 

 1 void stringDis(char *str)
 2 {
 3     //int len = sizeof(str) / sizeof(char); //error if there is space
 4     //int len = strlen(str);    //<string.h>
 5     int len = my_strlen(str); //same as strlen()
 6     for (int i = 0; i < len;i++)
 7     {
 8         printf("%c", str[i]);
 9     }
10     printf("\n");
11 }