➨ 2 ❶㻌 ₇⩦
₇⩦㻝㻚 㼃㼕㼚㼐㼛㼣㼟 䝣䜷䞊䝮䝁䞁䝖䝻䞊䝹䛾฼⏝㻌
[䝁䝰䞁䝁䞁䝖䝻䞊䝹]䜹䝔䝂䝸䛾䝁䞁䝖䝻䞊䝹䜢฼⏝䛧䛶䚸ᇶᮏⓗ䛺౯᱁ィ⟬䜰䝥䝸䜿䞊䝅䝵䞁䜢సᡂ䛧䜎
䛩䚹
䝇䝔䝑䝥㻝㻚 䝴䞊䝄䞊䜲䞁䝍䞊䝣䜵䜲䝇䛾సᡂ㻌
㻝㻚
㼂㼕㼟㼡㼍㼘㻌㻿㼠㼡㼐㼕㼛㻌 䜢㉳ື䛧䛶䛔䛺䛔ሙྜ䛿㉳ື䛧䜎䛩䚹㻌
㻞㻚
䝯䝙䝳䞊䝞䞊䛛䜙㼇䝣䜯䜲䝹㼉㻙㼇㛤䛟㼉㻙㼇䝥䝻䝆䜵䜽䝖㻌 㻛㻌 䝋䝸䝳䞊䝅䝵䞁㼉䜢㑅ᢥ䛧䜎䛩䚹㼇䝥䝻䝆䜵䜽䝖䜢㛤
䛟㼉䝎䜲䜰䝻䜾䛜⾲♧䛥䜜䜎䛩䚹㻌
㻟㻚
㼇䝥䝻䝆䜵䜽䝖䜢㛤䛟㼉䝎䜲䜰䝻䜾䛷䚸௨ୗ䛾䝋䝸䝳䞊䝅䝵䞁䜢㛤䛝䜎䛩䚹㻌
₇⩦⏝ࢹ࣮ࢱࣇ࢛ࣝࢲ࣮¥㑅ᢥࡋࡓゝㄒ¥Starter¥➨ 2 ❶¥CalcPrices¥CalcPrices.sln
㻠㻚
㻯㼍㼘㼏㻼㼞㼕㼏㼑㼟 䝋䝸䝳䞊䝅䝵䞁ෆ䛾 㻲㼛㼞㼙㻝㻚㼏㼟㻌 㻛㻌 㻲㼛㼞㼙㻝㻚㼢㼎 䜢 㼃㼕㼚㼐㼛㼣㼟 䝣䜷䞊䝮䝕䝄䜲䝘䞊䛷㛤䛝䜎䛩䚹
㻲㼛㼞㼙㻝 䛾䝕䝄䜲䞁䛿௨ୗ䛾䜘䛖䛻䛺䛳䛶䛔䜎䛩䚹㻌
㻡㻚
䛂ၟရ䛃䛸⾲♧䛥䜜䛶䛔䜛䝁䞁䝖䝻䞊䝹㻔㻸㼍㼎㼑㼘 䝁䞁䝖䝻䞊䝹㻕䜢㑅ᢥ䛧䚸䝥䝻䝟䝔䜱䜴䜱䞁䝗䜴䛷㻔㻺㼍㼙㼑㻕䝥
䝻䝟䝔䜱䛻タᐃ䛥䜜䛶䛔䜛್䜢☜ㄆ䛧䜎䛩䚹㻌
㻢㻚
๓䛾ᡭ㡰䛸ྠᵝ䛻䚸௚䛾䝁䞁䝖䝻䞊䝹䛻䛴䛔䛶䜒㻔㻺㼍㼙㼑㻕䝥䝻䝟䝔䜱䛻タᐃ䛥䜜䛶䛔䜛್䜢☜ㄆ䛧䜎䛩䚹㻌
㻣㻚
㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䝁䞁䝖䝻䞊䝹䜢㑅ᢥ䛧䚸䝥䝻䝟䝔䜱䜴䜱䞁䝗䜴䛷 㻵㼠㼑㼙㼟 䝥䝻䝟䝔䜱䜢㑅ᢥ䛧䜎䛩䚹㻵㼠㼑㼙㼟
䝥䝻䝟䝔䜱䛾ྑ➃䛻䝡䝹䝎䞊䝪䝍䞁㻔ୗᅗཧ↷㻕䛜⾲♧䛥䜜䜛䛾䛷䚸䜽䝸䝑䜽䛧䜎䛩䚹㼇ᩥᏐิ䝁䝺䜽䝅䝵
䞁䜶䝕䜱䝍䞊㼉䝎䜲䜰䝻䜾䛜⾲♧䛥䜜䜎䛩䚹㻌
129
➨ 2 ❶㻌 ₇⩦
㻤㻚
㼇ᩥᏐิ䝁䝺䜽䝅䝵䞁䜶䝕䜱䝍䞊㼉䝎䜲䜰䝻䜾䛷䚸䛂䜚䜣䛤䛃䚸䛂䜏䛛䜣䛃䚸䛂䜀䛺䛺䛃䛸 㻝 ⾜䛪䛴ධຊ䛧䜎䛩䚹
ධຊᚋ䚸㼇㻻㻷㼉䝪䝍䞁䜢䜽䝸䝑䜽䛧䛶䝎䜲䜰䝻䜾䜢㛢䛨䜎䛩䚹㻌
䝇䝔䝑䝥㻞㻚 䝣䜱䞊䝹䝗䛚䜘䜃䜲䝧䞁䝖䝝䞁䝗䝷䞊䛾㏣ຍ㻌
1.
㼇䝋䝸䝳䞊䝅䝵䞁䜶䜽䝇䝥䝻䞊䝷䞊㼉䛛䜙䚸䛂㻲㼛㼞㼙㻝㻚㼏㼟㻛㻲㼛㼞㼙㻝㻚㼢㼎䛃䜢ྑ䜽䝸䝑䜽䛧䚸㼇䝁䞊䝗䛾⾲♧㼉䜢㑅ᢥ䛧
䜎䛩䡝䜶䝕䜱䝍㡿ᇦ䛜䚸㻲㼛㼞㼙㻝 䛾䝣䜷䞊䝮䝕䝄䜲䝘䞊䛛䜙䚸䝁䞊䝗䜶䝕䜱䝍䞊䛻ษ䜚᭰䜟䜚䜎䛩䚹
㻞㻚
⮬ື⏕ᡂ䛥䜜䛯 㻲㼛㼞㼙㻝 䛾㒊ศ䜽䝷䝇㻔㼜㼍㼞㼠㼕㼍㼘㻛㻼㼍㼞㼠㼕㼍㼘 䜽䝷䝇㻕䜢♧䛩䝁䞊䝗䛜⾲♧䛥䜜䜛䛾䛷䚸㻲㼛㼞㼙㻝
䜽䝷䝇䛻ḟ䛾䝣䜱䞊䝹䝗䜢㏣ຍ䛧䜎䛩䚹㻌
䖃 㻯㻏㻌
䜰䜽䝉䝇ಟ㣭Ꮚ㻌
䝕䞊䝍ᆺ㻌
ኚᩘྡ㻌
ึᮇ್㻌
㼜㼞㼕㼢㼍㼠㼑㻌
㼕㼚㼠 ᆺ㓄ิ㻌
㼡㼚㼕㼠㻼㼞㼕㼏㼑㼟㻌
㻝㻡㻜㻘㻌㻝㻜㻜㻘㻌㻤㻜㻌
㼜㼞㼕㼢㼍㼠㼑㻌
㼕㼚㼠㻌
㼟㼡㼎㼀㼛㼠㼍㼘㻌
㼇䛺䛧㼉㻌
䜰䜽䝉䝇ಟ㣭Ꮚ㻌
䝕䞊䝍ᆺ㻌
ኚᩘྡ㻌
ึᮇ್㻌
㻼㼞㼕㼢㼍㼠㼑㻌
㻵㼚㼠㼑㼓㼑㼞 ᆺ㓄ิ㻌
㼡㼚㼕㼠㻼㼞㼕㼏㼑㼟㻌
㻝㻡㻜㻘㻌㻝㻜㻜㻘㻌㻤㻜㻌
㻼㼞㼕㼢㼍㼠㼑㻌
㻵㼚㼠㼑㼓㼑㼞㻌
㼟㼡㼎㼀㼛㼠㼍㼘㻌
㼇䛺䛧㼉㻌
䖃 㼂㻮㻌
㻟㻚
㼇䝋䝸䝳䞊䝅䝵䞁䜶䜽䝇䝥䝻䞊䝷䞊㼉䛛䜙䚸䛂㻲㼛㼞㼙㻝㻚㼏㼟㻛㻲㼛㼞㼙㻝㻚㼢㼎䛃䜢䝎䝤䝹䜽䝸䝑䜽䛧䜎䛩䡝䜶䝕䜱䝍㡿ᇦ䛜䚸
130
➨ 2 ❶㻌 ₇⩦
㻲㼛㼞㼙㻝 䛾䝕䝄䜲䞁⏬㠃䛻ษ䜚᭰䜟䜚䜎䛩䚹䛂㼍㼐㼐㻯㼍㼞㼠㻮㼡㼠㼠㼛㼚䛃䝪䝍䞁䜢䝎䝤䝹䜽䝸䝑䜽䛧䚸᪤ᐃ䛾䜲䝧䞁
䝖䝝䞁䝗䝷㻔㻯㼘㼕㼏㼗 䜲䝧䞁䝖䝝䞁䝗䝷㻕䜢⏕ᡂ䛥䛫䜎䛩䚹⏕ᡂ䛥䜜䛯䜲䝧䞁䝖䝝䞁䝗䝷䞊䛻䚸ḟ䛾ฎ⌮䜢⾜䛖
䝇䝔䞊䝖䝯䞁䝖䜢グ㏙䛧䜎䛩䚹㻌
䖃 㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䛷ၟရ䛜㑅ᢥ䛥䜜䛶䛔䜛ሙྜ䚸㑅ᢥ䛥䜜䛯ၟရ䛾༢౯䜢 㼡㼚㼕㼠㻼㼞㼕㼏㼑 㓄ิ
䛛䜙ồ䜑䚸㼍㼙㼛㼡㼚㼠㼁㼜㻰㼛㼣㼚 䛷ᣦᐃ䛧䛯ಶᩘ䜢஌⟬䛧䛯್䜢 㼟㼡㼎㼀㼛㼠㼍㼘 䝣䜱䞊䝹䝗䛻䚸ຍ⟬䛩
䜛㻌
䖃 㼟㼡㼎㼀㼛㼠㼍㼘 䝣䜱䞊䝹䝗䛾್䜢䚸㼀㼛㻿㼠㼞㼕㼚㼓㻔㻎㼏㻎㻕䝯䝋䝑䝗䛷㏻㈌ᙧᘧ䛾ᩥᏐิ䛻ኚ᥮䛧䚸䛭䛾್
䜢 㼟㼡㼎㼀㼛㼠㼍㼘㻸㼍㼎㼑㼘 䛾 㼀㼑㼤㼠 䝥䝻䝟䝔䜱䛻タᐃ䛩䜛㻌
㻠㻚
ᡭ㡰 㻟㻚䛸ྠᵝ䛻䚸㼏㼘㼑㼍㼞㻯㼍㼞㼠㻮㼡㼠㼠㼛㼚 䛾 㻯㼘㼕㼏㼗 䜲䝧䞁䝖䝝䞁䝗䝷䞊䜢⏕ᡂ䛧䚸ḟ䛾ฎ⌮䜢⾜䛖䝇䝔䞊䝖䝯䞁
䝖䜢グ㏙䛧䜎䛩䚹㻌
䖃 㻸㼕㼟㼠㻮㼛㼤㻚㻯㼘㼑㼍㼞㻿㼑㼘㼑㼏㼠㼑㼐 䝯䝋䝑䝗䛷䚸㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䛾㑅ᢥ䛥䜜䛯㡯┠䜢ゎ㝖䛩䜛㻌
䖃 㻿㼥㼟㼠㼑㼙㻚㻿㼠㼞㼕㼚㼓 䜽䝷䝇䛾 㻱㼙㼜㼠㼥 䝥䝻䝟䝔䜱䛷䚸㼡㼚㼕㼠㻼㼞㼕㼏㼑㻸㼍㼎㼑㼘 䛚䜘䜃 㼟㼡㼎㼀㼛㼠㼍㼘㻸㼍㼎㼑㼘 䛾 㼀㼑㼤㼠
䝥䝻䝟䝔䜱䜢✵ḍ䛻䛩䜛㻌
䖃 㼍㼙㼛㼡㼚㼠㼁㼜㻰㼛㼣㼚 䛾 㼂㼍㼘㼡㼑 䝥䝻䝟䝔䜱䜢 㻜 䛻タᐃ䛩䜛㻌
䖃 㼟㼡㼎㼀㼛㼠㼍㼘 䝣䜱䞊䝹䝗䜢 㻜 䛻タᐃ䛩䜛㻌
㻡㻚
෌ᗘ 㻲㼛㼞㼙㻝 䛾䝕䝄䜲䞁⏬㠃䛻ᡠ䜚䚸㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䜢㑅ᢥ䛧䜎䛩䚹㼇䝥䝻䝟䝔䜱䜴䜱䞁䝗䜴㼉䜢䜲䝧䞁䝖
⾲♧䛻ษ䜚᭰䛘䚸㻿㼑㼘㼑㼏㼠㼑㼐㻵㼚㼐㼑㼤㻯㼔㼍㼚㼓㼑㼐 䜲䝧䞁䝖䛾䜲䝧䞁䝖䝝䞁䝗䝷䞊䜢⏕ᡂ䛧䜎䛩䚹⏕ᡂ䛥䜜䛯䜲
䝧䞁䝖䝝䞁䝗䝷䞊䛻䚸ḟ䛾ฎ⌮䜢⾜䛖䝇䝔䞊䝖䝯䞁䝖䜢グ㏙䛧䜎䛩䚹㻌
䖃 㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䛷ၟရ䛜㑅ᢥ䛥䜜䛶䛔䜛ሙྜ䛾䜏䚸㼜㼞㼛㼐㼡㼏㼠㻸㼕㼟㼠㻮㼛㼤 䛷㑅ᢥ䛥䜜䛯ၟရ䛾
༢౯䜢 㼡㼚㼕㼠㻼㼞㼕㼏㼑 㓄ิ䛛䜙ồ䜑䚸㏻㈌ᙧᘧ䛷 㼡㼚㼕㼠㻼㼞㼕㼏㼑㻸㼍㼎㼑㼘 䛻⾲♧䛩䜛㻌
㻢㻚
䛣䛣䜎䛷䛾ᡭ㡰䛷䚸㻲㼛㼞㼙㻝 䜽䝷䝇䛻㏣ຍ䛥䜜䛯䝁䞊䝗䛿௨ୗ䛾䜘䛖䛻䛺䜚䜎䛩䚹㻌
䖃 㻯㻏㻌
private int[] unitPrices = new int[] { 150, 100, 80 };
private int subTotal;
private void addCartButton_Click(object sender, EventArgs e)
{
if (productListBox.SelectedIndex != -1)
{
subTotal += unitPrices[productListBox.SelectedIndex] *
(int)amountUpDown.Value;
subTotalLabel.Text = subTotal.ToString("c");
}
}
private void clearCartButton_Click(object sender, EventArgs e)
{
productListBox.ClearSelected();
unitPriceLabel.Text = string.Empty;
subTotalLabel.Text = string.Empty;
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➨ 2 ❶㻌 ₇⩦
amountUpDown.Value = 0;
subTotal = 0;
}
private void productListBox_SelectedIndexChanged(object sender, EventArgs
e)
{
if (productListBox.SelectedIndex != -1)
{
unitPriceLabel.Text =
unitPrices[productListBox.SelectedIndex].ToString("c");
}
}
䖃 㼂㻮㻌
Private unitPrices As Integer() = {150, 100, 80}
Private subTotal As Integer
Private Sub addCartButton_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles addCartButton.Click
If productListBox.SelectedIndex <> -1 Then
subTotal += unitPrices(productListBox.SelectedIndex) *
Integer.Parse(amountUpDown.Value)
subTotalLabel.Text = subTotal.ToString("c")
End If
End Sub
Private Sub clearCartButton_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles clearCartButton.Click
productListBox.ClearSelected()
unitPriceLabel.Text = String.Empty
subTotalLabel.Text = String.Empty
amountUpDown.Value = 0
subTotal = 0
End Sub
Private Sub productListBox_SelectedIndexChanged(
ByVal sender As System.Object, ByVal e As System.EventArgs
) Handles productListBox.SelectedIndexChanged
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➨ 2 ❶㻌 ₇⩦
If productListBox.SelectedIndex <> -1 Then
unitPriceLabel.Text =
unitPrices(productListBox.SelectedIndex).ToString("c")
End If
End Sub
䝇䝔䝑䝥㻟㻚 䝡䝹䝗ཬ䜃ᐇ⾜⤖ᯝ䛾☜ㄆ㻌
㻝㻚
㼇䝕䝞䝑䜾㼉䝯䝙䝳䞊䛛䜙㼇䝕䝞䝑䜾䛺䛧䛷㛤ጞ㼉䜢㑅ᢥ䛧䜎䛩䚹⦅㞟䛧䛯ෆᐜ䛜ಖᏑ䛥䜜䝡䝹䝗䛜⾜䜟
䜜䛯ᚋ䚸ᐇ⾜䛥䜜䜎䛩䚹䜶䝷䞊䛜⾲♧䛥䜜䛯ሙྜ䛿䚸ᡭ㡰䜢ぢ┤䛧䛶䛟䛰䛥䛔䚹㻌
㻞㻚
ᐇ⾜⤖ᯝ䜢☜ㄆ䛧䜎䛩䚹䝸䝇䝖䝪䝑䜽䝇䛷ၟရ䜢㑅ᢥ䛩䜛䛸䛭䛾ၟရ༢౯䛜䝸䝇䝖䝪䝑䜽䝇䛾ୗ䛻⾲
♧䛥䜜䚸㼇䜹䝂䛻㏣ຍ㼉䝪䝍䞁䜢ᢲ䛩䛸䚸㼇ಶᩘ㼉䜢♧䛩 㼍㼙㼛㼡㼚㼠㼁㼜㻰㼛㼣㼚 䝁䞁䝖䝻䞊䝹䛷ᣦᐃ䛧䛯ಶᩘศ
䛰䛡㼇ᑠィ㼉ḍ䛻㔠㢠䛜⾲♧䛥䜜䜎䛩䚹䜎䛯䚸㼇䜽䝸䜰㼉䝪䝍䞁䜢ᢲ䛩䛸䚸䝸䝇䝖䝪䝑䜽䝇䛷䛾㑅ᢥ䛿ゎ㝖
䛥䜜䚸༢౯ཬ䜃ᑠィḍ䛜䜽䝸䜰䛥䜜䜎䛩䚹䜎䛯䚸ಶᩘ䜒 㻜 䛻䝸䝉䝑䝖䛥䜜䜎䛩䚹㻌
133