字符abcdef逆序为fedcba

#include<stdio.h>

#include<string.h>

int my_strlen(char* str)

{

 int count = 0;

 while(*str !='\0')

 {

   count++;

str++;

 }

 return count;

}

void reverse_string(char* str)

{

int left = 0;

int right= my_strlen(str)-1;

while(left<right)

{

char tmp = str[left];

str[left] = str[right];

str[right] = tmp;

left++;

right--;

}

}

int main()

{

 char arr[] = "abcdef";

 reverse_string(arr);

 printf("%s\n",arr);

return 0;

}