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Beginner with c# 4 |
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作者:未知 来源:月光软件站 加入时间:2005-2-28 月光软件站 |
1¡£4 Ô¤¶¨ÒåÀàÐÍ£¨Predefined types£©
c#ÌṩÁËһϵÁÐÔ¤¶¨ÒåÀàÐÍ¡£ËüÃÇÓëc/c++Óв»ÉÙÏàËÆµÄµØ·½¡£Ô¤¶¨ÒåÒýÓÃÀàÐÍÓÐobjectºÍstring¡£ objectÀàÐÍÊÇËùÓÐÆäËûÀàÐ͵Ļù´¡¡£
Ô¤¶¨ÒåÀàÐͰüÀ¨·ûºÅÊý¡¢ÎÞ·ûºÅÊý¡¢¸¡µã¡¢²¼¶û¡¢×Ö·ûºÍÊ®½øÖÆÊý¡£·ûºÅÊýÓУºsbyte¡¢short¡¢ intºÍlong£»ÎÞ·ûºÅÊýÓУºbyte¡¢ushort¡¢uintºÍulong£»¸¡µãÊýÓУºfloatºÍdouble¡£
²¼¶ûÀàÐ;ÍÏñÒ»¸ö¿ª¹Ø£¬Ö»ÓÐÁ½ÖÖ״̬£ºtrue»òfalse¡£c#¶Ô²¼¶ûµÄÒªÇó±Èc/c++Ñϸñ£¬ÓëjavaÀàËÆ¡£ ÔÚc#ÖÐfalse²»µÈÓÚ0£¬trueÒ²²»µÈÓÚ1£»falseºÍtrue¶¼Êǵ¥¶À·ÖÀë³öÀ´µÄÒ»¸öÖµ¡£Ñ§¹ýc/c++µÄÍøÓÑ ¶¼ÖªµÀ£º*/ int i = 0; if (i = 0) { // Bug: Ó¦¸ÃÊÇ (i == 0) .... } /* ÊÇûÓÐÎÊÌâµÄ¡£µ«ÔÚc#ÖлáÒý·¢Ò»¸ö±àÒë´íÎó£¨error CS0029: Cannot implicitly convert type 'int' to 'bool'£©¡£µ±È»£¬ÕâÑùÎþÉüÁËÒ»µãûÓбØÒªµÄÁé»îÐÔ¡£ÎÒÃÇÔÙÒ²²»ÄÜÕâÑù£º*/ string str; .... if(str = Console.ReadLine()) { Console.WriteLine("Your comments are: {0}",str); .... /* ¶ø±ØÐ룺*/ using System; class BoolTest { static void Main() { string str = Console.ReadLine();//Ò²¿ÉÒÔ£ºstring str; if(str == "") // if((str = Console.ReadLine()) == "") Console.WriteLine("i can't read your comments. Please tell me something! O.K.?"); else Console.WriteLine("Your comments are: {0}",str); } } /* ÎÒ³ÁËÒ»ÕÅÔ¤¶¨ÒåÀàÐ͵ļò±í¹©´ó¼Ò²Î¿¼¡£
Type Description Examples
object The ultimate base type of all other types object o = new Stack();
string String type; a string is a sequence of string s = "Hello"; Unicode characters
sbyte 8-bit signed integral type sbyte val = 12;
short 16-bit signed integral type short val = 12;
int 32-bit signed integral type int val = 12;
long 64-bit signed integral type long val1 = 12; long val2 = 34L;
byte 8-bit unsigned integral type byte val1 = 12; byte val2 = 34U;
ushort 16-bit unsigned integral type ushort val1 = 12; ushort val2 = 34U;
uint 32-bit unsigned integral type uint val1 = 12; uint val2 = 34U;
ulong 64-bit unsigned integral type ulong val1 = 12; ulong val2 = 34U; ulong val3 = 56L; ulong val4 = 78UL;
float Single-precision floating point type float value = 1.23F;
double Double-precision floating point type double val1 = 1.23 double val2 = 4.56D;
bool Boolean type; a bool value is either bool value = true; true or false
char Character type; a char value is a Unicode char value = 'h'; character
decimal Precise decimal type with 28 significant digits decimal value = 1.23M;
ÄãÒ²¿ÉÒÔ×Ô¶¨Òå×Ô¼ºµÄÔ¤¶¨ÒåÀàÐÍ£¬¿ÉÒÔÕâÑù£º*/ using System; struct Digit {...} class Test { static void TestInt() { int a = 1; int b = 2; int c = a + b; Console.WriteLine(c); } static void TestDigit() { Digit a = (Digit) 1; Digit b = (Digit) 2; Digit c = a + b; Console.WriteLine(c); } static void Main() { TestInt(); TestDigit(); } } /* ÕâÒ»½ÚÓеã³ÁÃÆ¡££º£¨

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