// Форма с: TextBox (textBox4), Button (button4), Label (label4)
private: System::Void button4_Click(System::Object^ sender, System::EventArgs^ e) {
String^ text = textBox4->Text;
array<String^>^ words = text->Split(' ', ',');
int count = 0;
for each (String^ word in words) {
if (word->ToLower()->Contains("a")) {
count++;
}
}
label4->Text = "Слов с буквой 'а': " + count.ToString() +
"\nВсего слов: " + words->Length.ToString();
}