This function checks that the input's format is correct and, subsequently, initialize the circuit's registers, creates the table and block the text boxes.

This function checks if the inputs are loaded correctly and executes the operation checking the lesser important bit of the register Q

with the function booth_check. This function change circuit's image, bit's value on image and refresh the table.

This function resets registers's value, flag, circuit's image, delete the old table and unlock the text boxes.

Initialize the registers's values with the value acquired from text boxes.

Take the multiplier as paramater and return his negative value in two's complement.

Take as parameters multiplier and multiplicand and executes the bit to bit sum ignoring an eventual carry bit coming from

the sum of most significant bit(bit of sign extention).

Take as parameter the register Q checking two less significant bit and it return the value that indicates the operation to be execute.

It returns 0 and 3 to do only the right aritmetical shift, 1 to do sum - shift, 2 to do subtract - shift.

These two functions are complementary and they do the right aritmetical shift considering the registers A and Q as a unique register.

This function checks that the values in the textboxes are part of the alphabet [1,0].

It checks that input's fields are not empty or containing values out of the range [0-1] (using the function control(val)

it returns the error's corresponding number.

Using the value returned by the function controlfield(), this function informs of eventual errors in approriate messages.

This function prints the registers's values in the appropriate spaces in the image.

This function highlights Q's two least significant bits that pinpoints the operation to execute.

This function restores the bits highlighted by the function booth_value_printing() to their original state.

This function , at the end of the execution of the program, highlights the result contained in the registers Q and A leaving out.

A's most significant bit and Q's least significant bit.

This function resets the bits in the image to their original state.