private static void Basic()
{
// 1. DataType
Console.WriteLine("=================== Data Type ================");
var dt = new DataType();
dt.Test();
// 2. Variable And Constant
Console.WriteLine("=================== Variable & Constant ================");
var vnc = new VariableAndConstant();
vnc.Test();
// 3. Array
Console.WriteLine("=================== Array ================");
var arr = new ArrayTest();
arr.Test();
// 4. String
Console.WriteLine("=================== String ================");
var strTest = new StringTest();
strTest.Test();
// 5. Enum
Console.WriteLine("=================== Enum ================");
var enumTest = new EnumTest();
enumTest.Test();
// 6. Operator
Console.WriteLine("=================== Operator ================");
var operatorTest = new OperatorTest();
operatorTest.Test();
// 7. If
Console.WriteLine("=================== If ================");
var ifTest = new IfTest();
ifTest.Test();
// 8. loop
Console.WriteLine("=================== Loop ================");
var loopTest = new LoopTest();
loopTest.Test();
// 9. yield keword: when collection data can be returned one by one in turn
Console.WriteLine("=================== yield return ================");
var yieldReturnTest = new yieldTest();
yieldReturnTest.Test();
// 10. Exception
Console.WriteLine("=================== Exception ================");
var exceptionTest = new ExceptionTest();
exceptionTest.Test(0, 0);
// 11. Struct
Console.WriteLine("=================== Struct ================");
var structTest = new StructTest();
structTest.ToString();
// 12. Nullable
Console.WriteLine("=================== Nullable ================");
var nullableTest = new NullableTest();
nullableTest.Test(null, null, DateTime.Now, null);
// 13. Method
Console.WriteLine("=================== Method ================");
var methodTest = new MethodTest();
// 13-1
int val = 1000;
methodTest.TestPassByValue(val);
Console.WriteLine("variable val's value is not changed: {0}", val);
// 13-2
int x = 0;
double y = 1.0;
double ret = methodTest.TestPassByRef(ref x, ref y);
Console.WriteLine("variable val's value is actually changed: x: {0} y: {1}", x, y);
Console.WriteLine(x);
Console.WriteLine(y);
// 13-3
int c, d;
bool bret = methodTest.TestPassByOut(10, 20, out c, out d);
Console.WriteLine("variable val's value is actually changed: c: {0} d: {1}", c, d);
// differenc between ref keyword and out keyword
// 13-4.
var returnValue = methodTest.TestDefaultParam(1, 2);
Console.WriteLine("Default parameter test: " + returnValue);
var returnValue2 = methodTest.TestDefaultParam(1, 2, "-----");
// 13-5.
var returnParamsValue = methodTest.TestParams(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
Console.WriteLine("params keyword test: " + returnParamsValue);
}