How do I open a .exe file from a form

closed account (iG3b7k9E)
How do you make a form open a .exe file that is somewhere else in the computer? I know this is a dumb question, but this is my first year programing and I'm trying to teach my self. Plus it is hard to find a teacher when you are in middle school.

Another problem I have is that when I make my calculators, I don't know how to make division find the decimal. Here is my calculator programing:

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private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
			 if (this->comboBox1->Text == "+")
				 this->textBox3->Text = System::Convert::ToString
                 ( System::Convert::ToInt16( this->textBox1->Text )
                 + System::Convert::ToInt16 ( this->textBox2->Text ));
			 if (this->comboBox1->Text == "-")
				 this->textBox3->Text = System::Convert::ToString
                 ( System::Convert::ToInt16( this->textBox1->Text )
                 - System::Convert::ToInt16 ( this->textBox2->Text ));
			 if (this->comboBox1->Text == "x")
				 this->textBox3->Text = System::Convert::ToString
                 ( System::Convert::ToInt16( this->textBox1->Text )
                 * System::Convert::ToInt16 ( this->textBox2->Text ));
			 if (this->comboBox1->Text == "/")
				 this->textBox3->Text = System::Convert::ToString
                 ( System::Convert::ToInt16( this->textBox1->Text )
                 / System::Convert::ToInt16 ( this->textBox2->Text ));
			 if (this->comboBox1->Text == "r")
				 this->textBox3->Text = System::Convert::ToString
                 ( System::Convert::ToInt16( this->textBox1->Text )
                 % System::Convert::ToInt16 ( this->textBox2->Text ));
		 }

If anybody knows how to do ether of these things please tell me how.
I'm only 13 and I need help with my programing.
The most advanced program I made was a Web browser, calculator, fun quiz, and Sudoku all in one.
closed account (iG3b7k9E)
I solved the opening a .exe file but not the division part.
closed account (iG3b7k9E)
Can anyone HELP. I need to know how to make the division work in my program like it does on normal calculator.
closed account (iG3b7k9E)
Never mind I figured it out.
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