1. BMI Form1 Body Mass Index textBox3-4 (readonly) trackBar1
trackBar1, trackBar2
Form1
Body Mass Index
textBox3-4
(readonly)
trackBar1
min(400),max(1000)
smallchange
trackBar2
min(150),max(190)
radioButton1
男 checked
radioButton2 女
radioButton1,2
label1, …, label4
textBox1, …, textBox4
by Szeto CY
Visual C# 2008

2. 雙按 (trackBar1,2)，並加入以下程式碼：
捲動/拉動
private void trackBar1_Scroll(object sender, EventArgs e) {
double wt = trackBar1.Value/10.0;
double ht = trackBar2.Value/100.0;
double bmi = wt/ht/ht;
textBox1.Text = wt.ToString("0.0");
textBox2.Text = ht.ToString("0.0");
textBox3.Text = bmi.ToString("0.00");
calculateBMI(); }
數字轉文字 改變
textBox1,2,3
by Szeto CY
Visual C# 2008

3. private void calculateBMI() { int n1=20, n2=25, n3=30;
double wt = double.Parse(textBox1.Text);
double ht = double.Parse(textBox2.Text);
double bmi = wt/ht/ht;
if (radioButton2.checked){
n1--; n2--; n3--; }
textBox4.BackColor = Color.Lavender;
if (bmi…
else if (bmi < n2){
textBox4.Text = "正常";
textBox4.BackColor = Color.LightGreen;
else if (bmi…
else …
文字轉數字
BMI=wtht²
by Szeto CY
Visual C# 2008

4. private void Form1_Load(object sender, EventArgs e) {
trackBar1.Value = 550;
trackBar2.Value = 165;
calculateBMI(); }
private void radioButton1_CheckedChanged (object sender, EventArgs e) {
calculateBMI(); }
private void radioButton2_CheckedChanged (object sender, EventArgs e)
by Szeto CY
Visual C# 2008