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C#の値型 サフィックス付き

値型 .NET Framework 型 サフィックス 有効範囲 有効桁数 他の型への暗黙の変換
bool System.Boolean true なし true/false - なし
byte System.Byte 20 なし 0 ~ 255 - short、ushort、int、uint、long、ulong、float、double、decimal
char System.Char '\u0058' なし U+0000 ~ U+ffff - ushort、int、uint、long、ulong、float、double、decimal
decimal System.Decimal 300.5m m/M ±1.0 × 10^-28 ~ ±7.9 × 10^28 28 ~ 29 なし
double System.Double 3.2d d/D ±5.0 × 10^-324 ~ ±1.7 × 10^308 15 ~ 16 なし
float System.Single 3.5f f/F ±1.5 × 10^-45 ~ ±3.4 × 10^38 7 double
int System.Int32 325 なし -2,147,483,648 ~ 2,147,483,647 - long、float、double、decimal
long System.Int64 4294967296L (l/)L -9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807 - float、double、decimal
sbyte System.SByte 127 なし -128 ~ 127 - short、int、long、float、double、decimal
short System.Int16 32767 なし -32,768 ~ 32,767 - int、long、float、double、decimal
uint System.UInt32 123U u/U 0 ~ 4,294,967,295 - long、ulong、float、double、decimal
ulong System.UInt64 123UL (l/)L
u/U
ul/UL
lu/LU

0 ~ 18,446,744,073,709,551,615

- float、double、decimal
ushort System.UInt16 65535 なし 0 ~ 65,535 - int、uint、long、ulong、float、double、decimal

 

サフィックスがない整数リテラルの型は、int、uint、long、ulong のうち、その整数の値を表すことができる最も範囲の狭い型になります。
サフィックスに L または l を使用した場合、リテラル整数の型は、サイズに応じて long または ulong のいずれかに決まります。
サフィックスに U または u を使用した場合、リテラル整数の型は、サイズに応じて uint または ulong のいずれかに決まります。
浮動小数点型のうちの 1 つが double である場合、式は double になります。関係式またはブール式では bool になります。
式に double 型が 1 つも存在しない場合、式は float になります。関係式またはブール式では bool になります。

int、uint、または long から floatへの変換、および long から double への変換では、有効桁数が桁落ちすることがありますが、絶対値は損なわれません。
char 型への暗黙の型変換はありません。
浮動小数点型と decimal 型の間には、暗黙の型変換はありません。
int 型の定数式は、定数式の値が変換後の型の範囲内である場合、sbyte、byte、short、ushort、uint、または ulong に変換できます。
long 型の定数式は、定数式の値が変換後の型の範囲内である場合、ulong に変換できます。(MSDNのHELPの場所は見つけられていません)

投稿日時 : 2007年12月27日 18:23

コメントを追加

# var を使う条件 2007/12/28 15:25 えムナウ Blog

var を使う条件

# re: C#の値型 サフィックス付き 2007/12/28 18:39 siokoshou

はじめまして!いつもblog記事にお世話になっております。
↑のほかに暗黙の定数式変換もありますね。int型の定数式は sbyte, byte, short, ushort, uint, ulong に変換可能でき、long型の定数式は値が負でなければ ulong に変換できます。
これを説明しないと「byte b = 1;」と書けることが説明つかないので、コメントしてみました。

# re: C#の値型 サフィックス付き 2007/12/28 19:11 えムナウ

>暗黙の定数式変換もありますね。
追加しました。

>long型の定数式は値が負でなければ ulong に変換できます。
確かにそのとおりですが、これのMSDNのHELPが見つかっていません。わかったら教えてください。

# re: C#の値型 サフィックス付き 2007/12/29 9:33 siokoshou

C#の仕様書の「暗黙の定数式変換」の部分にあります。MSDNにはあるのかなぁ…。詳細は仕様書参照となってるので記述はないかもしれません。

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