155 lines
4.4 KiB
C++
155 lines
4.4 KiB
C++
#include "Calculator.h"
|
|
#include <QVBoxLayout>
|
|
#include <QGridLayout>
|
|
#include <QString>
|
|
#include <QApplication>
|
|
|
|
|
|
Calculator::Calculator(QWidget *parent) : QWidget(parent)
|
|
{
|
|
setupUI(); // Set up the user interface
|
|
connectSignals(); // Connect signals and slots
|
|
setWindowTitle("Calculator"); // Set the window title
|
|
resize(300, 400); // Resize the window to a reasonable size
|
|
}
|
|
|
|
void Calculator::setupUI()
|
|
{
|
|
auto *mainLayout = new QVBoxLayout(this);
|
|
|
|
// Display setup
|
|
display = new QLineEdit("0");
|
|
display->setReadOnly(true);
|
|
display->setAlignment(Qt::AlignRight);
|
|
display->setStyleSheet("font-size: 18px; padding: 10px;");
|
|
mainLayout->addWidget(display);
|
|
|
|
// Button grid
|
|
auto *gridLayout = new QGridLayout();
|
|
|
|
// Clear button
|
|
clearBtn = new QPushButton("C");
|
|
gridLayout->addWidget(clearBtn, 0, 0, 1, 4);
|
|
|
|
// Number buttons
|
|
for (int i = 1; i <= 9; ++i)
|
|
{
|
|
auto *btn = new QPushButton(QString::number(i));
|
|
int row = 3 - (i - 1) / 3;
|
|
int col = (i - 1) % 3;
|
|
gridLayout->addWidget(btn, row, col);
|
|
connect(btn, &QPushButton::clicked, this, &Calculator::digitClicked);
|
|
}
|
|
|
|
// Zero button
|
|
auto *zeroBtn = new QPushButton("0");
|
|
gridLayout->addWidget(zeroBtn, 4, 0, 1, 2);
|
|
connect(zeroBtn, &QPushButton::clicked, this, &Calculator::digitClicked);
|
|
|
|
// Decimal point button
|
|
auto *dotBtn = new QPushButton(".");
|
|
gridLayout->addWidget(dotBtn, 4, 2);
|
|
connect(dotBtn, &QPushButton::clicked, this, &Calculator::digitClicked);
|
|
|
|
// Operator buttons
|
|
auto *addBtn = new QPushButton("+");
|
|
auto *subBtn = new QPushButton("-");
|
|
auto *mulBtn = new QPushButton("*");
|
|
auto *divBtn = new QPushButton("/");
|
|
equalBtn = new QPushButton("=");
|
|
|
|
gridLayout->addWidget(divBtn, 1, 3);
|
|
gridLayout->addWidget(mulBtn, 2, 3);
|
|
gridLayout->addWidget(subBtn, 3, 3);
|
|
gridLayout->addWidget(addBtn, 4, 3);
|
|
gridLayout->addWidget(equalBtn, 5, 0, 1, 4);
|
|
|
|
mainLayout->addLayout(gridLayout);
|
|
|
|
// Store buttons for connections
|
|
operatorButtons = {addBtn, subBtn, mulBtn, divBtn};
|
|
}
|
|
|
|
void Calculator::connectSignals()
|
|
{
|
|
for (auto *btn : operatorButtons)
|
|
{
|
|
connect(btn, &QPushButton::clicked, this, &Calculator::operatorClicked);
|
|
}
|
|
|
|
connect(clearBtn, &QPushButton::clicked, this, &Calculator::clearDisplay);
|
|
connect(equalBtn, &QPushButton::clicked, this, &Calculator::calculateResult);
|
|
}
|
|
|
|
void Calculator::digitClicked()
|
|
{
|
|
const auto *button = qobject_cast<QPushButton *>(sender());
|
|
const QString digit = button->text();
|
|
|
|
if (waitingForOperand) {
|
|
display->clear();
|
|
waitingForOperand = false;
|
|
}
|
|
|
|
if (display->text() == "0" && digit != ".") {
|
|
display->clear();
|
|
}
|
|
|
|
display->setText(display->text() + digit);
|
|
}
|
|
|
|
void Calculator::operatorClicked()
|
|
{
|
|
auto *button = qobject_cast<QPushButton *>(sender());
|
|
const QString op = button->text();
|
|
|
|
if (!waitingForOperand && !operation.isEmpty()) {
|
|
calculateResult();
|
|
}
|
|
|
|
firstNumber = display->text().toDouble();
|
|
operation = op;
|
|
waitingForOperand = true;
|
|
}
|
|
|
|
void Calculator::calculateResult()
|
|
{
|
|
if (waitingForOperand || operation.isEmpty()) {
|
|
return; // No operation to perform
|
|
}
|
|
|
|
double secondNumber = display->text().toDouble();
|
|
double result = 0.0;
|
|
|
|
if (operation == "+")
|
|
result = firstNumber + secondNumber;
|
|
else if (operation == "-")
|
|
result = firstNumber - secondNumber;
|
|
else if (operation == "*")
|
|
result = firstNumber * secondNumber;
|
|
else if (operation == "/")
|
|
{
|
|
if (secondNumber != 0)
|
|
result = firstNumber / secondNumber;
|
|
else
|
|
{
|
|
display->setText("Error");
|
|
clearDisplay();
|
|
return;
|
|
}
|
|
}
|
|
|
|
display->setText(QString::number(result));
|
|
operation.clear();
|
|
waitingForOperand = true;
|
|
}
|
|
|
|
void Calculator::clearDisplay()
|
|
{
|
|
display->setText("0");
|
|
firstNumber = 0.0;
|
|
operation.clear();
|
|
waitingForOperand = true;
|
|
}
|
|
|