변수

정수형식 

C# Type/keyword	Range	Size
sbyte	-128 ~ 127	Signed 8-bit integer
byte	0 ~ 255	Unsigned 8-bit integer
short	-32,768 ~ 32,767	Signed 16-bit integer
ushort	0 ~ 65,535	Unsigned 16-bit integer
int	-2,147,483,648 ~ 2,147,483,647	Signed 32-bit integer
uint	0 ~ 4,294,967,295	Unsigned 32-bit integer
long	-9,223,372,036,854,775,808~ 9,223,372,036,854,775,807	Signed 64-bit integer
ulong	0 ~ 18,446,744,073,709,551,615	Unsigned 64-bit integer
nint	Depends on platform(computed at runtime)	Signed 32-bit or 64-bit integer
nuint	Depends on platform(computed at runtime)	Unsingned 32-bit or 64-bit integer

ex) int hp = 100;

      int maxHp;

      maxHp = hp;

실수형

float a; // 4byte 

a = 3.14123f;

double b;//8byte

b = 3.5;

문자열("Coding")

string name;

name = "김철수";

char ch;//C#에서는 2byte 원래는 1byte 정수 아스키코드로 저장

ch = 'R';

bool 불리언(true/false)

bool a;

a = true;

a = false;

캐스팅 (형변환)

int a = 100;

short b = a; // error

short b = (short)a;//correct

작은 곳에서 큰곳으로는 가능하다

반대의 경우는 에러 발생

float c = a;

int d = c;//error;

int d = (int)c;//correct