form1.cs

Visual C#2005程序设计教程

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

namespace WinApp数据类型与表达式
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int ix = 0XABCD;
            label1.Text = "为ix赋值“0XABCD”后，ix=" + ix + "\n";
            //double dx=0XABCD.ef;   // 编译错误：“int”并不包含“ef”的定义
            //label1.Text += "为dx赋值“0XABCD.ef”后，dx=" + dx + "\n";
            float fx = 987654321.12345678f;
            label1.Text += "为float类型的fx赋值“987654321.12345678”后，fx=" + fx + "\n";
            double dx = 987654321.12345678;
            label1.Text += "为double类型的dx赋值“987654321.12345678”后，dx=" + dx + "\n";
            decimal mx = 987654321.12345678m;
            label1.Text += "为decimal类型的mx赋值“987654321.12345678”后，mx=" + mx + "\n";
            DateTime dtx = new DateTime(2006, 5, 30);
            label1.Text += "为DateTime类型的dtx赋值“2006,5,30”后，dtx="
                + dtx.ToShortDateString() + "\n";
            string s = "X"; char cc = Convert.ToChar(s);
            label1.Text += "为char类型的c赋值“string s = \"X\"; char cc = Convert.ToChar(s);”后，cc="
                + cc + "\n";
            int a = 3, b = 5, c = -1, d = 7;
            label1.Text += "21.设a=3,b=5,c=-1,d=7，求下列逻辑表达式的值。\n";
            label1.Text += "(1) a-b/c<d||c>d&&!(c>0)||d<c"
                + "为：" + (a - b / c < d || c > d && !(c > 0) || d < c) + "\n";
            label1.Text += "(2) a*d/(c*-a)>d%c||c>=d为:"
                 + (a * d / (c * -a) > d % c || c >= d) + "\n";
            label1.Text += "(3) (c+d)*(a-b)%2<c &&!(c>b)||d>c为:"
                 + ((c + d) * (a - b) % 2 < c && !(c > b) || d > c) + "\n";
            label1.Text += "(4) a-b>=c&&b-a>=d为:"
                 + (a - b >= c && b - a >= d) + "\n";
            //string sx; string sz = sx;
        }

        private void button2_Click(object sender, EventArgs oe)
        {
            int e = 1, f = 4, g = 2; float m = 10.5f , n = 4.0f , k ;
            label2.Text = "int e = 1, f = 4, g = 2; \nfloat m = 10.5 , n = 4.0 , k ;";
            k=(float) ((e + f ) / g + (double ) n * 1.2 / g + m);
            label2.Text += "\nk= (e + f ) / g + (double ) n * 1.2 / g + m=" + k;
            float x = 2.5f, y = 4.7f; int a = 7;
            label2.Text += "\nfloat x = 2.5, y = 4.7; int a = 7;";
            label2.Text += "\nx + a % 3 + (int ) (x + y ) % 2 / 4="
                + (x + a % 3 + (int)(x + y) % 2 / 4);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            int a = 7, b = -2, c = 4;
            label3.Text = "20. 设a=7，b=-2，c=4，求下列表达式的值。";
            label3.Text += "\n(1) a+3*c  (2) b*2/6  (3) a/2*3/2  (4) a%3+b*b/(float)c/5";
            label3.Text += "\n解答：(1)"+(a+3*c)+"  (2)"+(b*2/6)
                +"   (3)"+(a/2*3/2)+"   (4)"+(a%3+b*b/(float)c/5);
        }
    }
}