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Calculator: Add a simple calculator app

Closes https://github.com/SerenityOS/serenity/issues/319
This commit is contained in:
Sergey Bugaev 2019-08-09 13:55:20 +03:00 committed by Andreas Kling
parent 79f867238a
commit ccb482d1a7
10 changed files with 611 additions and 0 deletions

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#pragma once
#include <AK/AKString.h>
// This type implements number typing and
// displaying mechanics. It does not perform
// any arithmetic operations or anything on
// the values it deals with.
class Keypad final {
public:
Keypad();
~Keypad();
void type_digit(int digit);
void type_decimal_point();
void type_backspace();
double value() const;
void set_value(double);
String to_string() const;
private:
// Internal representation ofthe current decimal value.
bool m_negative { false };
long m_int_value { 0 };
long m_frac_value { 0 };
int m_frac_length { 0 };
// E.g. for -35.004200,
// m_negative = true
// m_int_value = 35
// m_frac_value = 4200
// m_frac_length = 6
enum class State {
External,
TypingInteger,
TypingDecimal
};
State m_state { State::External };
};