static void Main(string[] args)
{
object a = 100;
object c = 123456789L;
object w = "abcde";
Console.WriteLine(a);
Console.WriteLine(c);
Console.WriteLine(w);
Console.WriteLine(a.GetType()); //32로 통일되었지만
Console.WriteLine(c.GetType()); //롱은 아직 통일되지 않았다!(?)
Console.WriteLine(w.GetType());
Console.WriteLine("=============================");
if (a.GetType() == System.Type.GetType("System.Int32"))
{
Console.WriteLine("a is Int32");
}
float d = 1.2345f;
int e = (int)d;
int f = 12345;
float g = 3.1415f;
Console.WriteLine(e);
Console.WriteLine(f);
Console.WriteLine(g);
Console.WriteLine(f.ToString("D8")); // WriteLine("{0:D8}",f);
Console.WriteLine(g.ToString("F2"));
Console.WriteLine("=============================");
string h = "123456";
string m = "1.23456";
int o = int.Parse(h);
float p = float.Parse(m);
Console.WriteLine(o);
Console.WriteLine(p);
Console.WriteLine("=============================");
const int q = 567;
EFruit tmpEF = EFruit.EF_Banana;
Console.WriteLine(tmpEF);
if (tmpEF == EFruit.EF_Apple)
{
Console.WriteLine("APPLE");
}
switch (tmpEF)
{
case EFruit.EF_Apple:
Console.WriteLine("EF_Apple");
break;
case EFruit.EF_Banana:
Console.WriteLine("EF_Banana");
break;
case EFruit.EF_Lemon:
Console.WriteLine("EF_Lemon");
break;
}
Console.WriteLine("===========**************==================");
int[] tmpPoints = new int[(int)EFruit.EF_Count];
int i;
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
tmpPoints[i] = i + 1;
}
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
tmpPoints[i] = i + 1;
}
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
Console.Write(tmpPoints[i]);
Console.Write(" : ");
Console.WriteLine((EFruit)i);
Console.WriteLine((int)EFruit.EF_Count);
}
Console.WriteLine("=============================");
int?r = null; // r 에 값이 없음을 표현하기 위해 null, 보통이 아니므로 ?표시
Console.WriteLine(r.HasValue);
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
r = 234;
Console.WriteLine(r.HasValue);
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
Console.WriteLine("=============================");
int _a = 111;
int _b = _a + 50;
int _c = 5 * 7;
int _d = 123 / 5;
double _e = _d * 5.0;
int _f = _a++;
int _g = _f--;
string _h = "123" + "456";
string _j = (_c == 35)?"AAA":"BBB";
int _k = 1 << 4;
int _l = 1 << 3;
int _m = (_k | _l);
int _n = (_k | _l) & (1 << 3);
_c *= 3;
Console.WriteLine(_a);
Console.WriteLine(_b);
Console.WriteLine(_c);
Console.WriteLine(_d);
Console.WriteLine(_e);
Console.WriteLine(_f);
Console.WriteLine(_g);
Console.WriteLine(_h);
Console.WriteLine(_j);
Console.WriteLine(_k);
Console.WriteLine(_l);
Console.WriteLine(_m.ToString("X8"));
Console.WriteLine(_n.ToString("X8"));
//int tmpX = 7; int tmpY = 8;
//Console.WriteLine("{0:D2} + {1:D2} = {2:D2}", tmpX, tmpY, tmpX + tmpY);
int[] arr = { 1, 2, 3, 4, 5 };
for (int k = 0; k < arr.Length; k++)
{
if (arr[k] % 2 == 0)
{
continue;
}
Console.Write("{0}", arr[k]);
}
Console.WriteLine();
int total = 0; int tmpX = 10;
Increase(tmpX); total += tmpX;
MakeValue(out tmpX); total += tmpX;
Increase(ref tmpX); total += tmpX;
Console.WriteLine("total : " + total);
Console.ReadKey();
}
static void Main(string[] args)
{
object a = 100; //boxing
object c = 1234567890L; //boxing
object w = "abcde"; //boxing
Console.WriteLine(a);
Console.WriteLine(c);
Console.WriteLine(w);
//각 object가 가리키는 타입 출력
Console.WriteLine(a.GetType());
Console.WriteLine(c.GetType());
Console.WriteLine(w.GetType());
if (a.GetType() == System.Type.GetType("System.Int32"))
{
Console.WriteLine("a is Int32");
}
float d = 1.2345f;
int e = (int)d;
int f = 12345;
float g = 3.1415f;
Console.WriteLine(e);
Console.WriteLine(f);
Console.WriteLine(g);
//숫자형 문자형으로 변환
Console.WriteLine(f.ToString("D8"));
Console.WriteLine(g.ToString("F2"));
string h = "123456";
string m = "1.23456";
//문자형 숫자형으로 변환
int o = int.Parse(h);
float p = float.Parse(m);
Console.WriteLine(o);
Console.WriteLine(p);
const int q = 567; // const 키워드 사용으로 변경 불가
// q=123; error
EFruit tmpEF = EFruit.EF_Banana; //tmpEF = EF_Banana
if (tmpEF == EFruit.EF_Apple)
{
Console.WriteLine("Apple");
}
switch (tmpEF) //열거형도 들어갈 수 있음
{
case EFruit.EF_Apple:
Console.WriteLine("EF_Apple");
break;
case EFruit.EF_Banana:
Console.WriteLine("EF_Banana");
break;
case EFruit.EF_Lemon:
Console.WriteLine("EF_Lemon");
break;
}
int[] tmpPoints = new int[(int)EFruit.EF_Count]; //3
int i;
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
tmpPoints[i] = i + 1;
}
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
Console.Write(tmpPoints[i]);
Console.Write(" : ");
Console.WriteLine((EFruit)i);
}
int?r = null; //? : 변수에 값이 없을 수도 있음을 나타내는 키워드
Console.WriteLine(r.HasValue); //HasValue : 값이 있으면 true, 없으면 false 반환
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
r = 234;
Console.WriteLine(r.HasValue);
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
int _a = 111;
int _b = _a + 50;
int _c = 5 * 7;
int _d = 123 / 5;
double _e = _d * 5.0;
int _f = _a++;
int _g = _f--;
string _h = "123" + "456";
string _j = (_c == 35) ? "AAA" : "BBB";
int _k = 1 << 4;
int _l = 1 << 3;
int _m = (_k | _l);
int _n = (_k | _l) & (1 << 3);
_c *= 3;
Console.WriteLine(_a);
Console.WriteLine(_b);
Console.WriteLine(_c);
Console.WriteLine(_d);
Console.WriteLine(_e);
Console.WriteLine(_f);
Console.WriteLine(_g);
Console.WriteLine(_h);
Console.WriteLine(_j);
Console.WriteLine(_k);
Console.WriteLine(_l);
Console.WriteLine(_m.ToString("X8")); //16진수로 변환
Console.WriteLine(_n.ToString("X8"));
Console.ReadKey();
}
static void Main(string[] args)
{
object a = 100;
object c = 1234567890L;
object w = "abcde";
Console.WriteLine(a);
Console.WriteLine(c);
Console.WriteLine(w);
Console.WriteLine(a.GetType());
Console.WriteLine(c.GetType());
Console.WriteLine(w.GetType());
if (a.GetType() == System.Type.GetType("System.Int32"))
{
Console.WriteLine("a is Int32");
}
float d = 1.2345f;
int e = (int)d;
int f = 12345;
float g = 3.1415f;
Console.WriteLine(e);
Console.WriteLine(f);
Console.WriteLine(g);
Console.WriteLine(f.ToString("D8"));
Console.WriteLine(g.ToString("F2"));
Console.WriteLine("{0:D8}", f);
string h = "123456";
string m = "1.23456";
int o = int.Parse(h);
float p = float.Parse(m);
Console.WriteLine(o);
Console.WriteLine(p);
// const int gf = 567;
EFruit tmpEF = EFruit.EF_Banana;
Console.WriteLine(tmpEF);
if (tmpEF == EFruit.EF_Apple)
{
Console.WriteLine("Apple");
}
switch (tmpEF)
{
case EFruit.EF_Apple:
Console.WriteLine("EF_Apple");
break;
case EFruit.EF_Banana:
Console.WriteLine("EF_Banana");
break;
case EFruit.EF_Lemon:
Console.WriteLine("EF_Lemon");
break;
}
int[] tmpPoints = new int[(int)EFruit.EF_Count];
int i;
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
tmpPoints[i] = i + 1;
}
for (i = 0; i < (int)EFruit.EF_Count; i++)
{
Console.Write(tmpPoints[i]);
Console.Write(" : ");
Console.Write((EFruit)i);
}
int?r = null;
Console.WriteLine(r.HasValue);
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
r = 234;
Console.WriteLine(r.HasValue);
if (r.HasValue == true)
{
Console.WriteLine(r.Value);
}
int _a = 111;
int _b = _a + 50;
int _c = 5 * 7;
int _d = 123 / 5;
double _e = _d * 5.0;
int _f = _a++;
int _g = _f--;
string _h = "123" + "456";
string _j = (_c == 35) ? "AAA" : "BBB";
int _k = 1 << 4;
int _l = 1 << 3;
int _m = (_k | _l);
int _n = (_k | _l) & (1 << 3);
_c *= 3;
Console.WriteLine(_a);
Console.WriteLine(_b);
Console.WriteLine(_c);
Console.WriteLine(_d);
Console.WriteLine(_e);
Console.WriteLine(_f);
Console.WriteLine(_g);
Console.WriteLine(_h);
Console.WriteLine(_j);
Console.WriteLine(_k);
Console.WriteLine(_l);
Console.WriteLine(_m.ToString("X8"));
Console.WriteLine(_n.ToString("X8"));
Console.ReadKey();
}
