Question

我试图建立一个简单的小费计算器并获得小费应该是什么的精确值。我已经完成了大部分工作，但是我正在努力寻找小数点后的确切两个数字，因为它会使它们四舍五入。有人可以帮忙吗？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace project01LEA
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Lyndsee Armstrong\nCSIS 1400\nProject #1");
        }

        private void textBox1_Leave(object sender, EventArgs e)
        {
            //define variables
            const double POOR = 0.10;
            const double AVERAGE = 0.15;
            const double EXCELLENT = 0.20;

            double mealAmount = Convert.ToDouble(textBox1.Text);

            double doubledPoor = Convert.ToInt32(POOR * mealAmount);
            double doubledAverage = Convert.ToInt32(AVERAGE * mealAmount);
            double doubledExcellent = Convert.ToInt32(EXCELLENT * mealAmount);

            string outStr = string.Format("{0:C2}", doubledPoor);
            string outStr1 = string.Format("{0:C2}", doubledAverage);
            string outStr2 = string.Format("{0:C2}", doubledExcellent);

            textBox2.Text = outStr;
            textBox3.Text = outStr1;
            textBox4.Text = outStr2;
        }
    }
}

Answer 1

您的问题是Convert.ToInt32 - 将浮点值更改为整数值，而整数不会保留小数值。如果你删除这些行，这应该完全按照你想要的方式工作（字符串格式看起来正确）。

我该如何做到这样才能使货币四舍五入？

1 个答案: