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Calculator: Use KeypadValue class instead of double

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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.
This commit is contained in:
creator1creeper1 2021-08-01 13:08:53 +02:00 • committed by Ali Mohammad Pur
parent 97d2a5799e
commit 8f552c9979
6 changed files with 43 additions and 57 deletions
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42
Userland/Applications/Calculator/Keypad.cpp
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@ -6,6 +6,8 @@
*/
#include "Keypad.h"
#include "KeypadValue.h"
#include <AK/Math.h>
#include <AK/StringBuilder.h>
Keypad::Keypad()
@ -97,51 +99,29 @@ void Keypad::type_backspace()
}
}
double Keypad::value() const
KeypadValue Keypad::value() const
{
double res = 0.0;
u64 frac = m_frac_value.value();
for (int i = 0; i < m_frac_length; i++) {
u8 digit = frac % 10;
res += digit;
res /= 10.0;
frac /= 10;
}
res += m_int_value.value();
KeypadValue frac_part = { (i64)m_frac_value.value(), m_frac_length };
KeypadValue int_part = { (i64)m_int_value.value() };
KeypadValue res = int_part + frac_part;
if (m_negative)
res = -res;
return res;
}
void Keypad::set_value(double value)
void Keypad::set_value(KeypadValue value)
{
m_state = State::External;
if (value < 0.0) {
if (value.m_value < 0) {
m_negative = true;
value = -value;
} else
m_negative = false;
m_int_value = value;
value -= m_int_value.value();
m_frac_value = 0;
m_frac_length = 0;
while (value != 0) {
value *= 10.0;
int digit = value;
m_frac_value *= 10;
m_frac_value += digit;
m_frac_length++;
value -= digit;
if (m_frac_length > 6)
break;
}
m_int_value = value.m_value / (u64)AK::pow(10.0, (double)value.m_decimal_places);
m_frac_value = value.m_value % (u64)AK::pow(10.0, (double)value.m_decimal_places);
m_frac_length = value.m_decimal_places;
}
String Keypad::to_string() const