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我已经尝试了所有方法，但仍然不明白如何编写此代码

 #include<stdio.h>
 #include<string>
 #pragma warning(disable : 4996)

 using namespace std;
 int main()
 {
  char str[50] = "Hello word";
  int index,i;

  printf("The given string is =%s\n", str);
  while (str[i] != ' ')
      i++;
      index = i;

  printf("After reversing string is =%s", strrev(str));

  return 0;

}