利用C#实现inch和cm的互换（含源码）

 

 

原理：1inch = 1/12foot = 2.54cm = 25.4mm
说明：inch转cm时可精确转换，cm转inch时约等。
不当之处望指教。
点击下载：inchEXcm--liong.rar
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直接贴出源码:

//利用：1inch = 1/12foot = 2.54cm = 25.4mm 实现。
namespace inchEXcm
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }
        private double f = 0;
        private double i = 0;
        private double c = 0;
        private double r = 0;

        //字符串strIn若为空返回0;若为实数返回此实数的双精度值;若含字符串返回-1.
        private double GetNum(string strIn)
        {
            if (strIn == "")
            {
                return 0;
            }
            else 
            {
                try 
                {
                    double re = Convert.ToDouble(strIn);
                    return re;
                }
                catch
                {                   
                    return -1;
                }
            }
        }
        
        private void btnConvert_Click(object sender, EventArgs e)
        {            
            if (radinch.Checked)
            {
                //inch to cm
                f = GetNum(txtFoot.Text);
                if (f == -1)
                {
                    MessageBox.Show("Number only!", "Error",
                        MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
                i = GetNum(txtInch.Text);
                if (i == -1)
                {
                    MessageBox.Show("Number only!", "Error",
                        MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
                r = f * 12 * 2.54 + i * 2.54;
                txtCm.Text = r.ToString();
            }
            if (radcm.Checked)
            {
                //cm to inch
                c = GetNum(txtCm.Text);
                if (c == -1)
                {
                    MessageBox.Show("Number only!", "Error",
                        MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
                r = c / 2.54;
                txtFoot.Text = Convert.ToInt32(r / 12-r%12/12).ToString();//实现强制取整
                txtInch.Text = Convert.ToInt32(r % 12).ToString();               
            }
        }

        private void btnCopy_Click(object sender, EventArgs e)
        {
            string strCB = "";
            if (radinch.Checked)
            {
                strCB = txtCm.Text + "cm";
            }
            if (radcm.Checked)
            {
                strCB = txtFoot.Text + "foot " + txtInch.Text + "inch";
            }
            Clipboard.SetText(strCB);//复制到剪切板
            MessageBox.Show("Message '"+strCB+"' has been copied!", ";)", 
                MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void radinch_CheckedChanged(object sender, EventArgs e)
        {
            txtInch.Text = "0";
            txtFoot.Text = "0";
            txtCm.Text = "0";
            txtCm.Enabled = false;
            txtFoot.Enabled = true;
            txtInch.Enabled = true;
        }

        private void radcm_CheckedChanged(object sender, EventArgs e)
        {
            txtInch.Text = "0";
            txtFoot.Text = "0";
            txtCm.Text = "0";
            txtCm.Enabled = true;
            txtFoot.Enabled = false;
            txtInch.Enabled = false;
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("-=  inchEXcm v.01  =-/n/nliong/n20080402", "inchEXcm v0.1",
                MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

 

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