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 by goback: n/a

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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?

Nobody knows?

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 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.

``````#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->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
this->PerformLayout();

}
#pragma endregion

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;
}
}
};
}``````

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->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);