December 2022
Intermediate to advanced
208 pages
4h 44m
Japanese
Content preview from Python2年生 デスクトップアプリ開発のしくみ 体験してわかる！会話でまなべる！
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81
LESSON
10
BMI
値計算アプリ
BMI
値計算アプリの計画
BMI値は、「体重kg ÷ (身長m × 身長m)」で計算できます。身長（m）を「in1」、体重
（
kg）を「in2」として「in2 / (in1 * in1)」で求め、変数bmiに入れましょう。
この結果を、
f文字列を使って「BMI値は、○です。」と表示させたいと思います。割り
切れない場合もあるので小数点以下
2桁まで表示するとして、「f"BMI値は、{bmi:.2f}です。
"」と指定します。
テストとして、身長
1.6m、体重 60kgのBMI値の計算プログラムを作ってみましょう。以
下のプログラムを実行してください。
in1 = 1.60
in2 = 60
bmi = in2 / (in1 * in1)
txt = f"BMI
{bmi:.2f}"
print(txt)
BMI23.44
BMI
値計算アプリのレイアウト
次は、アプリの画面を考えます。
これも、２つの値を入力して、ボタンを押して、結果を表示するので、必要な部品は「身
長の入力欄（
in1）」 と「体重の入力欄（in2）」 と「実行ボタン（btn）」 と「結果表示のテ
キスト（
txt）」 です。さらに意味がわかるように「説明文のテキスト」を追加しましょう。
test306.py
出力結果
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