mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 02:52:43 +00:00
8f552c9979
Calculator now uses the KeypadValue class instead of double in its internal calculations. By not constantly converting to double back-and-forth, we do not use precision simply by, for example, negating a number. This fixes #7484.
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "Calculator.h"
|
|
#include "KeypadValue.h"
|
|
#include <AK/Assertions.h>
|
|
#include <AK/Math.h>
|
|
|
|
Calculator::Calculator()
|
|
{
|
|
}
|
|
|
|
Calculator::~Calculator()
|
|
{
|
|
}
|
|
|
|
KeypadValue Calculator::begin_operation(Operation operation, KeypadValue argument)
|
|
{
|
|
KeypadValue res = 0;
|
|
|
|
switch (operation) {
|
|
case Operation::None:
|
|
VERIFY_NOT_REACHED();
|
|
|
|
case Operation::Add:
|
|
case Operation::Subtract:
|
|
case Operation::Multiply:
|
|
case Operation::Divide:
|
|
m_saved_argument = argument;
|
|
m_operation_in_progress = operation;
|
|
return argument;
|
|
|
|
case Operation::Sqrt:
|
|
if (argument < 0) {
|
|
m_has_error = true;
|
|
return argument;
|
|
}
|
|
res = KeypadValue { AK::sqrt((double)argument) };
|
|
clear_operation();
|
|
break;
|
|
case Operation::Inverse:
|
|
if (argument == 0) {
|
|
m_has_error = true;
|
|
return argument;
|
|
}
|
|
res = KeypadValue { 1.0 / (double)argument };
|
|
clear_operation();
|
|
break;
|
|
case Operation::Percent:
|
|
res = argument * KeypadValue { 1, 2 }; // also known as `KeypadValue{0.01}`
|
|
break;
|
|
case Operation::ToggleSign:
|
|
res = -argument;
|
|
break;
|
|
|
|
case Operation::MemClear:
|
|
m_mem = 0;
|
|
res = argument;
|
|
break;
|
|
case Operation::MemRecall:
|
|
res = m_mem;
|
|
break;
|
|
case Operation::MemSave:
|
|
m_mem = argument;
|
|
res = argument;
|
|
break;
|
|
case Operation::MemAdd:
|
|
m_mem = m_mem + argument; //avoids the need for operator+=()
|
|
res = m_mem;
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
KeypadValue Calculator::finish_operation(KeypadValue argument)
|
|
{
|
|
KeypadValue res = 0;
|
|
|
|
switch (m_operation_in_progress) {
|
|
case Operation::None:
|
|
return argument;
|
|
|
|
case Operation::Add:
|
|
res = m_saved_argument + argument;
|
|
break;
|
|
case Operation::Subtract:
|
|
res = m_saved_argument - argument;
|
|
break;
|
|
case Operation::Multiply:
|
|
res = m_saved_argument * argument;
|
|
break;
|
|
case Operation::Divide:
|
|
if (argument == 0) {
|
|
m_has_error = true;
|
|
return argument;
|
|
}
|
|
res = KeypadValue { (double)m_saved_argument / (double)argument };
|
|
break;
|
|
|
|
case Operation::Sqrt:
|
|
case Operation::Inverse:
|
|
case Operation::Percent:
|
|
case Operation::ToggleSign:
|
|
case Operation::MemClear:
|
|
case Operation::MemRecall:
|
|
case Operation::MemSave:
|
|
case Operation::MemAdd:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
|
|
clear_operation();
|
|
return res;
|
|
}
|
|
|
|
void Calculator::clear_operation()
|
|
{
|
|
m_operation_in_progress = Operation::None;
|
|
m_saved_argument = 0;
|
|
clear_error();
|
|
}
|