#####生成范围内随机数并保留小数#####
1、代码
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private void FormGenrtRandom_Load(object sender, EventArgs e)
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{
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//默认保留小数点后两位
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comboBoxDecimalReserve.SelectedIndex = 2;
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}
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private void buttonConfirm_Click(object sender, EventArgs e)
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{
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//清空
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textBoxResult.Clear();
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exeWhenBtnClicked();
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}
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private void exeWhenBtnClicked()
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{
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//随机数左区间
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//随机数右区间
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//生成数量
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int startNum = Convert.ToInt32(textBoxStartNum.Text);
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int endNum = Convert.ToInt32(textBoxEndNum.Text);
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int countNum = Convert.ToInt32(textBoxCountNum.Text);
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//小数保留位数
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int selectedIndex = comboBoxDecimalReserve.SelectedIndex;
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int decimalPlace = selectedIndex;
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//储存随机数数组
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double[] res = new double[countNum];
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Random random = new Random();
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for (int i = 0; i < countNum; i++)
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{
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//设置时间间隔
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//使每次循环的随机数种子不同
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Thread.Sleep(1);
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double randNum = random.NextDouble() * (endNum - startNum) + startNum;
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//保留小数位数
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res[i] = Math.Round(randNum, decimalPlace);
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}
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for (int i = 0; i < countNum; i++)
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{
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//结果输出
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textBoxResult.Text = textBoxResult.Text
+ res[i].ToString()
+ Environment.NewLine;
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}
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}