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You can use the following steps to input the value of a variable into a text box in Visual C++:

1. Create a Windows Forms application in Visual C++.
2. Drag and drop a text box control from the toolbox onto the form.
3. Double-click on the button or event that you want to use to input the variable value.
4. In the event handler function, declare and initialize the variable.
5. Convert the variable to a string using the to_string() or sprintf() function.
6. Use the Text property of the text box control to set its value to the variable string.

Here is an example code snippet:

//Declare and initialize variable int myVariable = 25;

//Convert variable to string string myString = to_string(myVariable);

//Set the text box value to the variable string myTextBox->Text = gcnew String(myString.c_str());