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C#学习笔记之函数篇1

上一篇 / 下一篇 2007-09-03 14:48:57 / 个人分类：Visual Studio

XA+q |$T7O0using System;51Testing软件测试网W tzfGw'L
using System.Collections.Generic;
7u[$G)t%}Z0using System.Text;

namespace study
._"hBCk N0{
$G&dA-jX'}'?^0    class Program
    {51Testing软件测试网b,c/p0P5u
        //没有参数的函数
f^ ?h1P8j8d(YEe0        static void write()51Testing软件测试网Yre/R*N9t5`
        {51Testing软件测试网+p?:lM3u"T
            Console.Write("hello world!");
        }
%tp%H C~\:Y0        //带返回值的函数51Testing软件测试网G\5btPCq
        static int maxvalue(int[] intarray)51Testing软件测试网H zt1kT`*Jh
        {51Testing软件测试网 Q}"u3F^Y
            int maxval=intarray[0];
+s!s8ON+Y_!I\9e0            for (int i = 1; i < intarray.Length; i++)
AvD)];\;wMwn0            {
F}#nj(Du Qb0                if (intarray[i] > maxval)51Testing软件测试网P0H$X'W)t
                {51Testing软件测试网;STN3re&}L
                    maxval = intarray[i];
!|'rF/J*N0USa!`0                }
4v @ H"x9FlD(y6b9|pv0            }
            return maxval;

4S |9p3|)y!xs-]0        }
Vm|)hOa}0        //带返回值的params型参数数组
B!x,X1s[z y!v0        static int sumvals(params int[] vals)
M#i"Z$h G)l$}X0        {
            int sum=0;
Qk\7V LyTB0            foreach(int val in vals)
O4W%ssv2_%i0            {
e#u7T xA3j,G#i2X0                sum+=val;51Testing软件测试网-vD;B%oEeB
            }51Testing软件测试网 b|Z'T"f`6N
            return sum;
5fayIR'o_1}0        }

        //带ref的参数，无需返回值，会同步函数外的变量
]4nRs im k6O a0        static void showdouble(ref int val)
-N}EGL1}0        {
,W~.jF:One0            val*=2;
8U|5q-iIwy8XO'I0            Console.Write("val value={0}", val);
4I~VM5h0        }

        //带返回值的函数
B4BbIK0        static int maxvalue1(int[] intarray, out int maxindex)51Testing软件测试网1n-}+VzHZ8}
        {51Testing软件测试网3RB~,PCr
            int maxval = intarray[0];51Testing软件测试网{{F(qd
            maxindex = 0;51Testing软件测试网 n8u+Cb.b+v
            for (int i=1;i<intarray.Length;i++)
            {
TV0c[7O&l0                if (maxval<intarray[i])
                {
0JJU9~8~a)nP)i0                    maxval=intarray[i];
s$v|0Er t;p]6E0                    maxindex=i;
,}[5dZ |\[a/[p:F0                }
n+c,s']x"Bm0            }51Testing软件测试网+a;h+GkF#g
            return maxval;
        }

J3\AI&U$[U0        static void Main(string[] args)
:dv9MyW0^!Z0        {
IWp-]:{tk0
esncQ;Q4gG0            //调用没有参数没有返回的函数51Testing软件测试网cwQ;A ZRv
            write();

ozBzf\7R0            //调用单个参数为数组的函数
e!BG&?'x-ns8|kg0            int[] Myarray ={ 1, 2, 3, 5, 7, 9 };
            int maxval = maxvalue(Myarray);51Testing软件测试网#l-R1T pMR
            Console.Write("max value={0}", maxval);

            //调用使用数组参数的函数
            int sum = sumvals(1, 2, 3, 4, 5, 6, 7);51Testing软件测试网q+R8G'mZy#AQ
            Console.Write("sum value={0}", sum);51Testing软件测试网.m!zt1YNwd

B@%Z)j/Ci0            //调用带ref的函数，返回会修改myNumber值51Testing软件测试网7rG6eqoND
            int myNumber = 5;
            showdouble(ref myNumber);
$Dlg?BcY0            Console.Write("myNumber value={0}", myNumber);
4w"GE7eDJr0           51Testing软件测试网,P T&W.pW5W|

            //调用带返回值的函数
&l3J:[ @8i+yF0            int[] myarray ={ 1, 3, 4, 25, 7, 4, 6, 3, 4 };
7a4SlnU0            int maxindex;
.f5GM*XDhW0            Console.Write("myarray value={0}", maxvalue1(myarray,out maxindex));51Testing软件测试网AsKkoZ
            Console.Write("Maxindex is :{0}", maxindex+1);
lL&_{6F0           51Testing软件测试网|p/OU.g.G
            Console.ReadKey();
        }
    }51Testing软件测试网$B&q!}1Om;Nu
}
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