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Calculator: Add a simple calculator app

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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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116
Applications/Calculator/Calculator.cpp Normal file
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#include "Calculator.h"
#include <AK/Assertions.h>
#include <math.h>
Calculator::Calculator()
{
}
Calculator::~Calculator()
{
}
double Calculator::begin_operation(Operation operation, double argument)
{
double res = 0.0;
switch (operation) {
case Operation::None:
ASSERT_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 < 0.0) {
m_has_error = true;
return argument;
}
res = sqrt(argument);
clear_operation();
break;
case Operation::Inverse:
if (argument == 0.0) {
m_has_error = true;
return argument;
}
res = 1 / argument;
clear_operation();
break;
case Operation::Percent:
res = argument * 0.01;
break;
case Operation::ToggleSign:
res = -argument;
break;
case Operation::MemClear:
m_mem = 0.0;
res = argument;
break;
case Operation::MemRecall:
res = m_mem;
break;
case Operation::MemSave:
m_mem = argument;
res = argument;
break;
case Operation::MemAdd:
m_mem += argument;
res = m_mem;
break;
}
return res;
}
double Calculator::finish_operation(double argument)
{
double res = 0.0;
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 == 0.0) {
m_has_error = true;
return argument;
}
res = m_saved_argument / 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:
ASSERT_NOT_REACHED();
}
clear_operation();
return res;
}
void Calculator::clear_operation()
{
m_operation_in_progress = Operation::None;
m_saved_argument = 0.0;
}