探索C#对象模型(一个C#风格的C++程序)
上一篇 / 下一篇 2012-09-21 13:11:57 / 个人分类:C++
写C#程序就是在设计一个类!
h^h@$U+X nc0 51Testing软件测试网 Zlq et`b先看一个C#程序(表达式求值):
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51Testing软件测试网6jI$~ U5flt r5Fausing System;51Testing软件测试网s'jL5R+BB%E\
using System.Collections.Generic;
S@Wz!zT.P0using System.Linq;
/G6w&J6XAC%wy,O0using System.Text;
namespace ConsoleApplicationCal51Testing软件测试网r4m(J-]-eY&c9b
{51Testing软件测试网calx8koI N2x8~V]
class Program
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private static char[,] Precede_Matrix = new char[7, 7]
JR;d(]*WE*Q7K)x0 {
5]AW4h;mS%S0 {'>', '>', '<', '<', '<', '>', '>',},
&a$Hu9dS,L0 {'>', '>', '<', '<', '<', '>', '>',},
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f4ECj0 {'>', '>', '>', '>', '<', '>', '>',},51Testing软件测试网j0mP6Q-j
{'>', '>', '>', '>', '<', '>', '>',},
.R!@#~:wj}#?0 {'<', '<', '<', '<', '<', '=', '0',},
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|D0 {'>', '>', '>', '>', '0', '>', '>',},51Testing软件测试网B*q&A&u4gNVA
{'<', '<', '<', '<', '<', '0', '=',}
c]6q+{KSu0 };
F6~a^?!i(p&EW0 public static char Precede(char a, char b)
e+fh-SF"l2Ms0 {
[/R6b,afLti uf0 int i = 0;51Testing软件测试网nfA
o8]
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int j = 0;51Testing软件测试网bPk%Z.y4w.},|R
switch (a)51Testing软件测试网o7{P}.h,@5|
{51Testing软件测试网 GRL:t/SK\
case '+': i = 0; break;51Testing软件测试网B#?+`N$rdoC
case '-': i = 1; break;
@+j^G+G!d7o3_6Up*St0 case '*': i = 2; break;
^ W(ggn5O;~L0 case '/': i = 3; break;
$f7T:c&J}fft;q0 case '(': i = 4; break;51Testing软件测试网2E0OJI8f|]
case ')': i = 5; break;51Testing软件测试网9V{(J%E^
|{
case '#': i = 6; break;
g$w9KW^N)T/sO0 default: break;
pe
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switch (b)51Testing软件测试网sh XV)K/S0J5S
{51Testing软件测试网Kn5nq4`VA4nP
case '+': j = 0; break;51Testing软件测试网-K$Y^#G N+P
case '-': j = 1; break;
'`U*t;wx*r0 case '*': j = 2; break;51Testing软件测试网Os)F+i-V)_
case '/': j = 3; break;
/{1CC{QV0 case '(': j = 4; break;51Testing软件测试网W J D5x6a d
case ')': j = 5; break;51Testing软件测试网VCD"Vh;Q
case '#': j = 6; break;51Testing软件测试网x"h/]av5_
default: break;
8A?!N1C3v0 }
/O&yS8I7q'sp{|6l~s0 return (Precede_Matrix[i, j]);51Testing软件测试网.s5O(lWPn
}
public static double Operate(double a, char oper, double b)
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switch (oper)
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case '+': return a + b;
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[8o)V? z0 case '-': return a - b;
3C+Qk `"T0 case '*': return a * b;51Testing软件测试网.u"|N5?%N|p
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case '/': return a / b;
e5G!T2PN[0 default: return -1;51Testing软件测试网)h!m)TY:l
}
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o}'cN1X:P0 public static bool IsOperand(char c)
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if (('0' <= c && c <= '9') || c == '.') // c是数字或小数点51Testing软件测试网#}Bp'^R"t0]Zk
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return true;51Testing软件测试网)mw$x5wz E4M$NUM
else
x]7J;T W+T/i0C V0 return false;51Testing软件测试网$lI'T~2I%_
}51Testing软件测试网xpv I.]
static void Main(string[] args)51Testing软件测试网XO b"UICF-?
{
&C2G8^^2v&Fc0 string str;51Testing软件测试网nZNf/x3m o*Z3z
while ((str = Console.ReadLine()) != null)
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U2POK(R%K0 {
"Ks8k k]:Z;m8U0 str += "#"; // 最后是#(结束标志)51Testing软件测试网eu9ub{n*lc
Bo7u
k2C4?
nNz0 double a;
q)m+GoK,D oJ0 double b;51Testing软件测试网,rQF6G6Ly#O
char x;
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Stack<char> PTR = new Stack<char>();
)FT vrh1y f0 OPTR.Push('#');51Testing软件测试网rQ7x
p{
Stack<double> PND = new Stack<double>();51Testing软件测试网A [!i1eM i%M
}Qo jQ4M,X0 int i = 0;51Testing软件测试网T$b}-|7RZU;Fj
char c = str[i++];
"j!A/[IdI%rF C N+^.h0 double perand = 0;51Testing软件测试网(f*^;`)yag
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while (!(c == '#' && OPTR.Peek() == '#'))
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if (IsOperand(c)) // c是数字或小数点(这里一定是数字),小数点已在下面转换掉了51Testing软件测试网1h2ki0f&at*yJ
{51Testing软件测试网{p
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int startIndex = i - 1;51Testing软件测试网W%pR:p;I}t}
int length = 1; // c是数字,故初始一定是151Testing软件测试网*t@*EpB"@;Hh
while (IsOperand(str[i]))
4?U)T:mTQ0 {
*dS_D4Rw0 i++;51Testing软件测试网IL7l
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length++;51Testing软件测试网+Z+Q
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}
string doubleString = str.Substring(startIndex, length);
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\w ]S0 // perand = atof(&str[i - 1]); // 把从c开头的数转化成double51Testing软件测试网KP*YM/]_}}
OPND.Push(double.Parse(doubleString));51Testing软件测试网7wDkj?P4xf
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c = str[i++];
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else // c is operator or delimiter
w
d1Ql*KP.O0 {
PXt;c[d?#\0 switch (Precede(OPTR.Peek(), c))51Testing软件测试网Bny*x1`Ja ^
{51Testing软件测试网J |XX2Us1]
"Q2bO:t5ukRE0 case '<':51Testing软件测试网B8R
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OPTR.Push(c);
*p$T{(Xk0 c = str[i++];
!x8Q5B8FW ua$|E0 break;
Z$Mex!e}&V0 case '=':
,~mHs6T,z0 x = OPTR.Pop();51Testing软件测试网b@K^/bSnB*l