How to write the code of a 3d vector calculator in Gui project?

the picture above is the part that i have done , and the coding is

private: System::Void Multiplication_Click(System::Object^ sender, System::EventArgs^ e) { String^ No1Str = textBox1stNum->Text; String^ No2Str = textBox2ndNum->Text;

Double No1Db1; Double No2Db1;

try { No1Db1 = Convert::ToDouble(No1Str); No2Db1 = Convert::ToDouble(No2Str); }

catch (Exception^ err) { ResultLabel->Text = "Please enter a valid number"; return; }

Double ResultDb1 = No1Db1 * No2Db1; String^ ResultStr = Convert::ToString(ResultDb1); ResultLabel->Text = "result = " + ResultStr; }

this is an example for my multiplication button, anyone please help me.

How to write the code of a 3d vector calculator in Gui project in C++?

Calculstor o PartA Parts PartC PartD 1st number : + 2nd number : : Result