static void Main(string[] args)
{
var person = new { Name = "A", Age = 30 };
Console.WriteLine(person.Age);
Console.WriteLine(person.Name);
Console.WriteLine(person.GetType().Name);
var student = new { Name = "B", Age = 20, Score = 100 };
Console.WriteLine(student.GetType().Name);
uint x = uint.MaxValue;
Console.WriteLine(x);
String binStr = Convert.ToString(x, 2);
Console.WriteLine(binStr);
try
{
uint y = unchecked (x + 1);
Console.WriteLine(y);
binStr = Convert.ToString(y, 2);
Console.WriteLine(binStr);
}
catch (OverflowException ex)
{
Console.WriteLine("error:" + ex.Message);
}
Console.WriteLine("int: " + sizeof(int));
Console.WriteLine("double: " + sizeof(double));
Console.WriteLine("long" + sizeof(long));
unsafe
{
Console.WriteLine("Student: " + sizeof(Student));
Student stu;
stu.Id = 1;
stu.Score = 100;
Student *pStu = &stu;
pStu->Id = 2;
pStu->Score = 59;
Console.WriteLine(stu.Id);
Console.WriteLine(pStu->Score);
}
int max = int.MaxValue;
int min = int.MinValue;
Console.WriteLine("max int:" + max);
Console.WriteLine(Convert.ToString(max, 2).PadLeft(32, '0'));
Console.WriteLine("min int:" + min);
Console.WriteLine(Convert.ToString(min, 2).PadLeft(32, '0'));
int _min = checked (-min);
Console.WriteLine("-min:" + _min);
}
StudentWrapper(String ^ fullname, double gpa)
{
_stu = new Student((char *)
System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(
fullname).ToPointer(),
gpa);
}
/// <summary>
/// 指针操作。
/// </summary>
static void PointerOperation()
{
Student student; //声明Student结构体的实例并初始化。
student.ID = 1;
student.Score = 99;
Console.WriteLine($"student-{student.ID}: {student.Score}"); //输出student-1: 99。
unsafe
{
Student *pStu = &student; //&操作符，获取实例student的内存地址。
pStu->Score = 100; //通过指针对字段的值进行修改。
(*pStu).ID = 2; //*操作符，引用指针pStu指向的实例，但由于“.”的运算优先级较高，故应当加上括号。
Console.WriteLine($"student-{student.ID}: {student.Score}"); //输出student-2: 100。
}
}
static void Main(string[] args)
{
unsafe
{
Student stu;
stu.ID = 1;
stu.Score = 100;
Student *pStu = &stu; //指针
pStu->Score = 99; //箭头符号
(*pStu).Score = 1000; //取地址符号和取引用符号
Console.WriteLine(stu.Score); //凡是用.访问的，都是直接访问，用就>-访问的是通过指针的间接访问
int x = sizeof(Student);
Console.WriteLine(x); //输出16,8+8
Console.ReadKey();
}
}
static void Main(string[] args)
{
unsafe
{
Student stu = new Student();
stu.ID = 0;
//Using x.y to access the member is the direct access.
stu.Score = 99;
//"&" is to get the memory address of stu.
Student *pStu = &stu;
//Using x->y to access the member is the indirect access.
pStu->Score = 100;
//"*"(point indrection) could obtain the variable pointed by a pointer.
//But it is inferior to the operator ".". That's why there is "()";
(*pStu).Score = 101;
Console.WriteLine(stu.Score);
}
}
static void Main(string[] args)
{
//unsafe so as to use pointers
unsafe
{
Student s1 = new Student(1, 95.0);
Student s2 = new Student(2, 79.5);
//declaring two student pointer and initializing them with addresses
Student *s1_ptr = &s1;
Student *s2_ptr = &s2;
//using arrow operator
Console.WriteLine("Details os Student1");
Console.WriteLine("Roll No: {0} & Marks: {1}", s1_ptr->rollno, s1_ptr->marks);
Console.WriteLine("Roll No: {0} & Marks: {1}", s2_ptr->rollno, s2_ptr->marks);
Console.ReadLine();
}
}
static void Main(string[] args)
{
var person = new { Name = "Mr.Okay", Age = 34 };
Console.WriteLine(person.Age);
uint x = uint.MaxValue;
checked
{
try
{
//uint y = checked(x + 1);
uint y = x + 1;
Console.WriteLine(y);
}
catch (OverflowException ex)
{
Console.WriteLine("There is overflow!");
}
}
unsafe
{
Student stu;
stu.ID = 1;
stu.Score = 99;
Student *pStu = &stu;
pStu->Score = 100;
(*pStu).Score = 101;
Console.WriteLine(stu.Score);
}
Stone stone = new Stone();
stone.Age = 5000;
//Monkey wukongSun = (Monkey)stone; for explicit
Monkey wukongSun = stone; //implict
Console.WriteLine(wukongSun.Age);
int x1 = 7;
int y1 = 28;
int z1 = x1 ^ y1;
String strX = Convert.ToString(x1, 2).PadLeft(32, '0');
String strY = Convert.ToString(y1, 2).PadLeft(32, '0');
String strZ = Convert.ToString(z1, 2).PadLeft(32, '0');
Console.WriteLine(strX);
Console.WriteLine(strY);
Console.WriteLine(strZ);
if (x1 > y1 && x1++ > 8) //skip x1++, better avoid
{
Console.WriteLine("Hello");
}
Console.WriteLine(x1);
Nullable <int> x2 = null; //int? x2 = null;
int y2 = x2 ?? 1;
string str = (x2 >= 60) ? "Pass" : "Failed";
Console.WriteLine(x2);
}
