문자열 뒤집기 초간단 샘플..

/* reverse : reverse string input in place */

char* reverse(char* input)
{
      int len,start,end;
      char* result;
      
      len=strlen(input);
      result=(char *)malloc(len+1);
      
      for(start=0, end=len-1; start<=len; start++, end--)
                *(result+start)=*(input+end); 
      
      *(result+len)='\0';
        
      return result;
}

int main()
{
    char* result;
    result=reverse("12345");
    printf("%s",result);
    getch();

    free(result);
    return 0;
}