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Calculator: Change internal representation to support perfect division

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The purpose of this patch is to support addition, subtraction,
multiplication and division without using conversion to double. To this
end, we use the BigFraction class of LibCrypto. With this solution, we
can store values without any losses and forward rounding as the last
step before displaying.
This commit is contained in:
Lucas CHOLLET 2022-01-12 11:05:03 +01:00 • committed by Sam Atkins
parent 4ab8ad2ed2
commit 53eb35caba
10 changed files with 110 additions and 361 deletions
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24
Userland/Applications/Calculator/CalculatorWidget.cpp
View file

@ -8,9 +8,9 @@
*/
#include "CalculatorWidget.h"
#include "KeypadValue.h"
#include <Applications/Calculator/CalculatorGML.h>
#include <LibCore/Event.h>
#include <LibCrypto/BigFraction/BigFraction.h>
#include <LibGUI/Button.h>
#include <LibGUI/Label.h>
#include <LibGUI/TextBox.h>
@ -50,14 +50,14 @@ CalculatorWidget::CalculatorWidget()
m_clear_button = *find_descendant_of_type_named<GUI::Button>("clear_button");
m_clear_button->on_click = [this](auto) {
m_keypad.set_value(0.0);
m_keypad.set_to_0();
m_calculator.clear_operation();
update_display();
};
m_clear_error_button = *find_descendant_of_type_named<GUI::Button>("clear_error_button");
m_clear_error_button->on_click = [this](auto) {
m_keypad.set_value(0.0);
m_keypad.set_to_0();
update_display();
};
@ -99,18 +99,18 @@ CalculatorWidget::CalculatorWidget()
m_equals_button = *find_descendant_of_type_named<GUI::Button>("equal_button");
m_equals_button->on_click = [this](auto) {
KeypadValue argument = m_keypad.value();
KeypadValue res = m_calculator.finish_operation(argument);
m_keypad.set_value(res);
Crypto::BigFraction argument = m_keypad.value();
Crypto::BigFraction res = m_calculator.finish_operation(move(argument));
m_keypad.set_value(move(res));
update_display();
};
}
void CalculatorWidget::perform_operation(Calculator::Operation operation)
{
KeypadValue argument = m_keypad.value();
KeypadValue res = m_calculator.begin_operation(operation, argument);
m_keypad.set_value(res);
Crypto::BigFraction argument = m_keypad.value();
Crypto::BigFraction res = m_calculator.begin_operation(operation, move(argument));
m_keypad.set_value(move(res));
update_display();
}
@ -134,9 +134,9 @@ String CalculatorWidget::get_entry()
return m_entry->text();
}
void CalculatorWidget::set_entry(KeypadValue value)
void CalculatorWidget::set_entry(Crypto::BigFraction value)
{
m_keypad.set_value(value);
m_keypad.set_value(move(value));
update_display();
}
@ -167,7 +167,7 @@ void CalculatorWidget::keydown_event(GUI::KeyEvent& event)
m_keypad.type_decimal_point();
mimic_pressed_button(m_decimal_point_button);
} else if (event.key() == KeyCode::Key_Escape || event.key() == KeyCode::Key_Delete) {
m_keypad.set_value(0.0);
m_keypad.set_to_0();
m_calculator.clear_operation();
mimic_pressed_button(m_clear_button);
} else if (event.key() == KeyCode::Key_Backspace) {