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mainwindow.cpp
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mainwindow.cpp
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#include "mainwindow.h"
#include "./ui_mainwindow.h"
double firstNum;
bool userIsTypingSecoundNum = false;
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->pushButton_0, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_1, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_2, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_3, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_4, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_5, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_6, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_7, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_8, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_9, SIGNAL(released()), this, SLOT(digit_pressed()));
connect(ui->pushButton_plusMinus, SIGNAL(released()), this, SLOT(unary_operation_pressed()));
connect(ui->pushButton_percentage, SIGNAL(released()), this, SLOT(unary_operation_pressed()));
connect(ui->pushButton_add, SIGNAL(released()), this, SLOT(binary_operation_pressed()));
connect(ui->pushButton_substract, SIGNAL(released()), this, SLOT(binary_operation_pressed()));
connect(ui->pushButton_multiply, SIGNAL(released()), this, SLOT(binary_operation_pressed()));
connect(ui->pushButton_divide, SIGNAL(released()), this, SLOT(binary_operation_pressed()));
ui->pushButton_add->setCheckable(true);
ui->pushButton_substract->setCheckable(true);
ui->pushButton_multiply->setCheckable(true);
ui->pushButton_divide->setCheckable(true);
}
void MainWindow::digit_pressed()
{
QPushButton * button = (QPushButton*)sender();
double labelNumber;
QString newLable;
if((ui->pushButton_add->isChecked() || ui->pushButton_substract->isChecked() ||
ui->pushButton_multiply->isChecked() || ui->pushButton_divide->isChecked()) && (!userIsTypingSecoundNum))
{
labelNumber = button->text().toDouble();
userIsTypingSecoundNum = true;
newLable = QString::number(labelNumber,'g', 15);
}
else
{
if(ui->label->text().contains('.') && button->text() == "0")
{
newLable = ui->label->text() + button->text();
}
else
{
labelNumber = (ui->label->text() + button->text()).toDouble();
newLable = QString::number(labelNumber,'g', 15);
}
}
ui->label->setText(newLable);
}
bool pressed = false;
void MainWindow::on_pushButton_decimal_released()
{
if(pressed == false)
ui->label->setText(ui->label->text() + ".");
pressed = true;
}
void MainWindow::unary_operation_pressed()
{
QPushButton *button = (QPushButton*) sender();
double labelNumber;
QString newLable;
if (button->text() == "+/-")
{
labelNumber = ui->label->text().toDouble();
labelNumber = labelNumber * -1;
newLable = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLable);
}
if (button->text() == "%")
{
labelNumber = ui->label->text().toDouble();
labelNumber = labelNumber * 0.01;
newLable = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLable);
}
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clear_released()
{
ui->pushButton_add->setChecked(false);
ui->pushButton_substract->setChecked(false);
ui->pushButton_multiply->setChecked(false);
ui->pushButton_divide->setChecked(false);
userIsTypingSecoundNum = false;
ui->label->setText("0");
}
void MainWindow::on_pushButton_equal_released()
{
double labelNumber, secoundNum;
QString newLabel;
secoundNum = ui->label->text().toDouble();
if(ui->pushButton_add->isChecked())
{
labelNumber = firstNum + secoundNum;
newLabel = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLabel);
ui->pushButton_add->setChecked(false);
}
else if(ui->pushButton_substract->isChecked())
{
labelNumber = firstNum - secoundNum;
newLabel = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLabel);
ui->pushButton_substract->setChecked(false);
}
else if(ui->pushButton_multiply->isChecked())
{
labelNumber = firstNum * secoundNum;
newLabel = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLabel);
ui->pushButton_multiply->setChecked(false);
}
else if(ui->pushButton_divide->isChecked())
{
labelNumber = firstNum / secoundNum;
newLabel = QString::number(labelNumber, 'g', 15);
ui->label->setText(newLabel);
ui->pushButton_divide->setChecked(false);
}
userIsTypingSecoundNum = false;
}
void MainWindow::binary_operation_pressed()
{
QPushButton *button = (QPushButton*) sender();
firstNum = ui->label->text().toDouble();
}