编写C#类 [英] Writting C# classes

问题描述

伙计们，有人可以告诉我这段代码有什么问题吗，它给了我编译错误.我有条件分配的变量的使用未分配的局部变量".

Pls guys, can someone tell me whats wrong with this code, it give me compile error; "Use of unassigned local variable" for the variables i conditionally assigned.

internal string reinforcement(int[,] a, int b, double c, double d, double e, char f)  //market, dia, breath, depth, As, steel type
        {
            double As_min = 0.0, As_max;
            int g;
            string type;

            As_max = 4 * c * d;

            if (f == 'H')
            {
                As_min = 0.13 * c * d;
                type = "Y";
            }
            else if (f == 'M')
            {
                As_min = 0.24 * c * d;
                type = "R";
            }

            switch (b)
            {
                case 8: g = 0; break;
                case 10: g = 1; break;
                case 12: g = 2; break;
                case 16: g = 3; break;
                case 20: g = 4; break;
                case 25: g = 5; break;
                case 32: g = 6; break;
                case 40: g = 7; break;
                default: g = 0; break;
            }

            int h, m;

            if (e > As_min && e < As_max)
            {
                for (int j = g; j < 8; j++)
                {
                    for (int k = 2; k < 9; k++)
                    {
                        if (e >= a[j, k])
                            continue;
                        else
                        {
                            h = k;                      // no. of reinforcements
                            m = j;                      // diameter of reinforcements
                            goto end;
                        }
                    }
                }
            }
            else if (e < As_min)
            {
                for (int j = g; j < 8; j++)
                {
                    for (int k = 2; k < 9; k++)
                    {
                        if (e >= a[j, k])
                            continue;
                        else
                        {
                            h = k;                      // no. of reinforcements
                            m = j;                      // diameter of reinforcements
                            goto end;
                        }
                    }
                }
            }
        end: ;

            int n;

            switch (m)
            {
                case 0: n = 8; break;
                case 1: n = 10; break;
                case 2: n = 12; break;
                case 3: n = 16; break;
                case 4: n = 20; break;
                case 5: n = 25; break;
                case 6: n = 32; break;
                case 7: n = 40; break;
            }

            string provide = "";

            if (e == 0)
                provide = "";
            else
                provide = "\t\tProvide " + h + "" + type + n + "(" + a[m, h] + "mm^2)";

            return provide;
        }

推荐答案

(很正确)发现type可能永远不会得到值:

It has (quite rightly) spotted that type may never get a value:

string type;

As_max = 4 * c * d;

if (f == 'H')
{
    As_min = 0.13 * c * d;
    type = "Y";
}
else if (f == 'M')
{
    As_min = 0.24 * c * d;
    type = "R";
}

如果f既不是"H"也不是"M"会发生什么?可能在您的特定应用程序中，reinforcement将永远不会以f不等于另一个的方式被调用-但是编译器不知道这一点！


[edit] Fat finger syndrome ...-OriginalGriff [/edit]

What happens if f is neither ''H'' or ''M''? Probably, in your specific application, reinforcement will never be called with f not equal to one or the other - but the compiler doesn''t know that!


[edit]Fat fingers syndrome... - OriginalGriff[/edit]

避免此类错误的最佳方法是在定义时为所有变量分配默认值，就像您所做的那样. As_min.
您的问题可能出在h和m上，因为它们可以被使用而无需分配值.

注意:为变量赋予有意义的名称将使您的代码更易于阅读.

The best way to avoid errors like this is to assign a default value to all variables when defined, like you did with As_min.
Your problem is probably with h and m as they can be used without getting a value assigned.

Note: Giving variables meaningful names will make your code more easy to read.

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