I have got a homework named greatest common divisor of two integers write in C++ in MS visual c++ 2008 in windows form. Using listbox, textbox... I don't know how write this programme. Please help me thank you. Sorry for my English.

Edited 6 Years Ago by goback: n/a

I have got a homework named greatest common divisor of two integers write in C++ in MS visual c++ 2008 in windows form. Using listbox, textbox... I don't know how write this programme. Please help me thank you. Sorry for my English.

Not exactly sure what you mean

You want a program, that has two textboxes. You press a button and it finds the greatest common divisor.

If this is the case, I can't help you. However, if you just want a simple .exe program (like, run from MS c++ or Linux Terminal), I can help you.

#include <iostream>



using namespace std;



int main()

{

int a = 0;

int b = 0;

cout << "First #: ";

cin >> a;

cout << "Second #: ";

cin >> b;

cout << "\n\n";

int biggest = 0;

int counta = 1;

int gcd = 0;

if(a >= b){biggest = a;}

if(b > a){biggest = b;}

while(counta <= biggest/2)

{

if(a%counta==0 && b%counta==0){gcd = counta;}

++counta;

}

cout << gcd;



cout << "\n\n";

return 0;

}

Thank you for reply. But I need program which has two textboxes maybe listbox and button like you said. Can help me somebody else?

Do you know how to calculate the GCD of a value? That's the code that goes into you CALC button.

If you are asking how to interface with the form, textboxes, and buttons from the beginning, you need a tutorial, not a forum. We help people solve problems, we are not teachers.

Try to use this function to calculate the GCD of two numbers:

int computeGCD (const int& intA, const int& intB) {
    if (intB == 0)
        return intA;
    return computeGCD (intB, intA % intB);
}

Edited 6 Years Ago by n.utiu: n/a

Well. I tried wrote this programme but i have problem. I create 1x listbox, 2x textboxes and 1x button. When I will compile this, then I will write some numbers to textboxes (example 8 to textbox1 and 4 to textbox2). Afterward I will click on the button but a answer is 0.

Please tell me where I made mistake. Thank you.

#pragma once


namespace av {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Summary for Form1
	///
	/// WARNING: If you change the name of this class, you will need to change the
	///          'Resource File Name' property for the managed resource compiler tool
	///          associated with all .resx files this class depends on.  Otherwise,
	///          the designers will not be able to interact properly with localized
	///          resources associated with this form.
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^  button1;
	protected: 
	private: System::Windows::Forms::ListBox^  listBox1;
	private: System::Windows::Forms::TextBox^  textBox1;
	private: System::Windows::Forms::TextBox^  textBox2;

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->listBox1 = (gcnew System::Windows::Forms::ListBox());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->textBox2 = (gcnew System::Windows::Forms::TextBox());
			this->SuspendLayout();
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(102, 231);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 0;
			this->button1->Text = L"button1";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// listBox1
			// 
			this->listBox1->FormattingEnabled = true;
			this->listBox1->Location = System::Drawing::Point(81, 12);
			this->listBox1->Name = L"listBox1";
			this->listBox1->Size = System::Drawing::Size(120, 95);
			this->listBox1->TabIndex = 1;
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(12, 159);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(100, 20);
			this->textBox1->TabIndex = 2;
			// 
			// textBox2
			// 
			this->textBox2->Location = System::Drawing::Point(180, 159);
			this->textBox2->Name = L"textBox2";
			this->textBox2->Size = System::Drawing::Size(100, 20);
			this->textBox2->TabIndex = 3;
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 266);
			this->Controls->Add(this->textBox2);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->listBox1);
			this->Controls->Add(this->button1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
		
		int a,b,answer;
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

			 textBox1->Clear();
			 textBox2->Clear();

	while (a!=b) {
    if (a>b)
      a=a-b;
    else
      b=b-a;  
  }
listBox1->Items->Add(answer);
			 }
	};
}

Hi. Homework is almost done. When I enter to textbox1 example number 1 and to textbox2 number 0 and conversely then the programme will brake down. But if I enter only 0 so the programme running normal. Please tell me how write this part. Thank you.

#pragma once


namespace skoroporeseny {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Summary for Form1
	///
	/// WARNING: If you change the name of this class, you will need to change the
	///          'Resource File Name' property for the managed resource compiler tool
	///          associated with all .resx files this class depends on.  Otherwise,
	///          the designers will not be able to interact properly with localized
	///          resources associated with this form.
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^  button1;
	protected: 
	private: System::Windows::Forms::TextBox^  textBox1;
	private: System::Windows::Forms::TextBox^  textBox2;
	private: System::Windows::Forms::ListBox^  listBox1;

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->textBox2 = (gcnew System::Windows::Forms::TextBox());
			this->listBox1 = (gcnew System::Windows::Forms::ListBox());
			this->SuspendLayout();
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(107, 214);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 0;
			this->button1->Text = L"button1";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(12, 162);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(100, 20);
			this->textBox1->TabIndex = 1;
			// 
			// textBox2
			// 
			this->textBox2->Location = System::Drawing::Point(180, 162);
			this->textBox2->Name = L"textBox2";
			this->textBox2->Size = System::Drawing::Size(100, 20);
			this->textBox2->TabIndex = 2;
			// 
			// listBox1
			// 
			this->listBox1->FormattingEnabled = true;
			this->listBox1->Location = System::Drawing::Point(86, 12);
			this->listBox1->Name = L"listBox1";
			this->listBox1->Size = System::Drawing::Size(120, 95);
			this->listBox1->TabIndex = 3;
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 266);
			this->Controls->Add(this->listBox1);
			this->Controls->Add(this->textBox2);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->button1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
		String ^st;
		double a,b;
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
	if (textBox1->Text !="" || textBox2->Text !="" ){
		st = textBox1->Text;
		a = Convert::ToDouble(st);
		st = textBox2->Text;
		b = Convert::ToDouble(st);

		textBox1->Clear();
		textBox2->Clear();

		listBox1->Items->Clear();
  
	if (a <= 0 || b <= 0)
	{
		MessageBox::Show("Number must be greater than 0");
	}	

	while (a != b)
	{
		if (a > b)
		{
			a = a - b;
		}
		else
		{
			b = b - a;
		}
    }
		st = Convert::ToString(a);
		listBox1->Items->Add(st);}
	else 
	{
		MessageBox::Show("No numbers entered");
	}

			 }
	};
}
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