此练习的输出? [英] output of this Exercise?

问题描述

您好，请问您可以逐步将这个问题解答给我7、7、14吗?

非常感谢.

Hi, may u forward me please in steps how this question get to this answer 7, 7 , 14 ?

many thanks.

int cal (ref int x , ref int y , int z)
{
x = x + z + 2;
y = x + z + 3;
z=y;
return x;
}
int x = 2 , y = 4 , z = 1 ;
y = cal ( ref z , ref x , y);

添加了代码块[/编辑]

OP的其他信息是从下面的评论中复制的
老师把答案写成:
A)5、6、4
B)7、7、14
C)14、14、7
D)7，7，7

它需要知道输出中x，y，z的值是什么?
请帮帮我...明天我又要进行C#考试...谢谢

Code block added[/Edit]

OP''s additional information copied from comment below
the teacher put this answers as:
A) 5, 6 , 4
B) 7, 7 , 14
C) 14 , 14 , 7
D) 7 , 7 , 7

it needs to know what''s the value of x , y , z in output?
please please help me ... tomorrow i have again C# exam ... thanks

推荐答案

Y始终等于X，所以只需选择一个

Y is always equal to X, so just pick that one

private static int cal(ref int x, ref int y, int z)
        {
            Console.WriteLine("Function Start");

            Console.WriteLine("ref z= {0};ref x={1};y={2}", x, y, z);
            x = x + z + 2;
            Console.WriteLine("ref z= {0};ref x={1};y={2}", x, y, z);
            y = x + z + 3;
            Console.WriteLine("ref z= {0};ref x={1};y={2}", x, y, z);
            z = y;
            Console.WriteLine("ref z= {0};ref x={1};y={2}", x, y, z);
            Console.WriteLine("Function End\n");
            return x;
        }


        private static void Main(string[] args)
        {
            int x = 2, y = 4, z = 1;
            Console.WriteLine("x= {0};y={1};z={2}\n",x,y,z);
            y = cal(ref z, ref x, y);
            Console.WriteLine("x= {0};y={1};z={2}", x, y, z);

        }

x= 2;y=4;z=1

Function Start
ref z= 1;ref x=2;y=4
ref z= 7;ref x=2;y=4
ref z= 7;ref x=14;y=4
ref z= 7;ref x=14;y=14
Function End

x= 14;y=7;z=7

您正在传递一些参数作为参考，这意味着每次在 cal内部分配值时，这意味着什么函数，由于 ref ，该值将自动重定向到外部.所以...第一行的X值不是第二行的X值，因为引用的X改变了外部的值.

另一个非常重要的事情是Richard MacCutchan已经告诉您的内容... 请注意参数的顺序

You are passing some parameters as reference, what it means everytime you assign a value inside the cal function, the value will be automatically redirected to the outside because of ref. So... the value of X at the first line is not the value of X on the second line, because referenced X has changed the value of the outside.

Another very important thing is what Richard MacCutchan already told you... pay attention to the order of the parameters

<br />
outside X = inside Y<br />
outside Y = inside Z<br />
outside Z = inside X<br />

[edit]拼写更正[/edit]

[edit]spelling corrected[/edit]

为什么不使用调试器逐步调试它，您将能够准确地看到发生了什么.还要注意传递给方法cal的变量的顺序.

Why not step through it with your debugger and you will be able to see exactly what happens. Notice also the order of variables passed in to method cal.

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