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使用C#怎么實(shí)現(xiàn)一個(gè)加減乘除計(jì)算器?很多新手對此不是很清楚,為了幫助大家解決這個(gè)難題,下面小編將為大家詳細(xì)講解,有這方面需求的人可以來學(xué)習(xí)下,希望你能有所收獲。
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace WindowsApplication1 { public partial class Main : Form { public Main() { InitializeComponent(); } private void Main_Load(object sender, EventArgs e) { } private void txtInshu1_TextChanged(object sender, EventArgs e) { } private void txtInshu1_KeyPress(object sender, KeyPressEventArgs e) { OnlyEnterNumber(sender, e); } //// <summary> /// 只能輸入數(shù)字(含負(fù)號小數(shù)點(diǎn)) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public static void OnlyEnterNumber(object sender, KeyPressEventArgs e) { if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 && e.KeyChar != 13 && e.KeyChar != 45 && e.KeyChar != 46) { e.Handled = true; } // 輸入為負(fù)號時(shí),只能輸入一次且只能輸入一次 if (e.KeyChar == 45 && (((TextBox)sender).SelectionStart != 0 || ((TextBox)sender).Text.IndexOf("-") >= 0)) e.Handled = true; if (e.KeyChar == 46 && ((TextBox)sender).Text.IndexOf(".") >= 0) e.Handled = true; } /* * 參數(shù):d表示要四舍五入的數(shù);i表示要保留的小數(shù)點(diǎn)后位數(shù)。 * 正負(fù)數(shù)都四舍五入,適合數(shù)據(jù)統(tǒng)計(jì)的顯示 */ double Round(double d, int i) { if (d >= 0) { d += 5 * Math.Pow(10, -(i + 1)); } else { d += -5 * Math.Pow(10, -(i + 1)); } string str = d.ToString(); string[] strs = str.Split('.'); int idot = str.IndexOf('.'); string prestr = strs[0]; string poststr = strs[1]; if (poststr.Length > i) { poststr = str.Substring(idot + 1, i); } string strd = prestr + "." + poststr; d = Double.Parse(strd); return d; } private void txtInshu2_TextChanged(object sender, EventArgs e) { } private void txtInshu2_KeyPress_1(object sender, KeyPressEventArgs e) { OnlyEnterNumber(sender, e); } private void btnJisuan_Click(object sender, EventArgs e) { if (txtInshu1.Text == "") { MessageBox.Show("因數(shù)1不能為空!", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning); return; } if (txtInshu2.Text == "") { MessageBox.Show("因數(shù)2不能為空!", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning); return; } double inshu1 = Convert.ToDouble(txtInshu1.Text); double inshu2 = Convert.ToDouble(txtInshu2.Text); double result = 0.0; if (radioBtnJia.Checked) { result = inshu1 + inshu2; } if (radioBtnJian.Checked) { result = inshu1 - inshu2; } if (radioBtnCheng.Checked) { result = inshu1 * inshu2; } if (radioBtnChu.Checked) { if (0 == inshu2) { MessageBox.Show("因數(shù)2做除數(shù)不能為0!", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning); return; } result = inshu1 / inshu2; result = Round(result, 6); } txtResult.Text = Convert.ToString(result); } } }
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