华氏温度和摄氏温度之间的转换 [英] Conversion Between Fahrenheit and Celsius ISSUE

问题描述

我从一本精锐的书开始就有这个问题 以便在华氏温度和摄氏温度之间转换.

i have this problem from a beginning c sharp book this for conversion between Fahrenheit and Celsius.

    private void button1_Click(object sender, EventArgs e)
{
    float fahr, cel;
    if (Celsius.Checked == true)
    {
        fahr = float.Parse(textBox1.Text);
        cel = (5/9)*(fahr-32);
        richTextBox1.Text = "The Degree in Celsius is:" + cel.ToString() + Environment.NewLine + "cool isn't it!?";
    }
    else if (Fahrenheit.Checked == true )
    {
        cel = float.Parse(textBox1.Text);
        fahr = ((9 * cel)/5)+ 32;
        richTextBox1.Text = "The degree in Fahrenheit is:" + fahr.ToString() + Environment.NewLine + "cool is it!?";
    }

当我想从华氏温度中获取摄氏温度时，即使公式对我来说是正确的，它也会一直给我0. 这里怎么了?
因为我认为问题出在这里:

when i want to get Celsius from a Fahrenheit it keeps giving me 0 even though the formula appears to be true to me. what's wrong here?
because i think the problem lies here:

        if (Celsius.Checked == true)
    {
        fahr = float.Parse(textBox1.Text);
        cel = (5/9)*(fahr-32);
        richTextBox1.Text = "The Degree in Celsius is:" + cel.ToString() + Environment.NewLine + "cool isn't it!?";

也许我对Ops of Ops有问题，但是我认为这是真的吗? 谢谢你的帮助.

maybe i have something wrong with Order of Ops but i think it's True? thanks for help.

推荐答案

请尝试在此处放置另一个演员，就像这样:

Try putting another cast there just to be sure, like this:

cel = ((float)5/9)*(fahr-32);

最有可能5/9计算为整数并给出0.其他选项如下:

Most probably 5/9 evaluate as ints and gives 0. Other option would be like this:

cel = (5f/9f)*(fahr-32);

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