PyQt Four Function Calculator

PyQt Four Function Calculator – To create a PyQt program with three QLineEdit widgets for input, labels, six buttons for performing mathematical operations (Add, Subtract, Multiply, Divide, Clear, Exit), and a third QLineEdit widget for displaying the result, you can use the following code:


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QPushButton

class CalculatorApp(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('Simple Calculator')
        self.setGeometry(100, 100, 400, 200)

        self.num1_label = QLabel('Enter Number 1:')
        self.num1_edit = QLineEdit()

        self.num2_label = QLabel('Enter Number 2:')
        self.num2_edit = QLineEdit()

        self.result_label = QLabel('Result:')
        self.result_edit = QLineEdit()
        self.result_edit.setReadOnly(True)

        self.add_button = QPushButton('Add')
        self.subtract_button = QPushButton('Subtract')
        self.multiply_button = QPushButton('Multiply')
        self.divide_button = QPushButton('Divide')
        self.clear_button = QPushButton('Clear')
        self.exit_button = QPushButton('Exit')

        self.add_button.clicked.connect(self.add)
        self.subtract_button.clicked.connect(self.subtract)
        self.multiply_button.clicked.connect(self.multiply)
        self.divide_button.clicked.connect(self.divide)
        self.clear_button.clicked.connect(self.clear)
        self.exit_button.clicked.connect(self.close)

        # Layout
        input_layout = QVBoxLayout()
        input_layout.addWidget(self.num1_label)
        input_layout.addWidget(self.num1_edit)
        input_layout.addWidget(self.num2_label)
        input_layout.addWidget(self.num2_edit)

        button_layout = QVBoxLayout()
        button_layout.addWidget(self.add_button)
        button_layout.addWidget(self.subtract_button)
        button_layout.addWidget(self.multiply_button)
        button_layout.addWidget(self.divide_button)
        button_layout.addWidget(self.clear_button)
        button_layout.addWidget(self.exit_button)

        result_layout = QVBoxLayout()
        result_layout.addWidget(self.result_label)
        result_layout.addWidget(self.result_edit)
        result_layout.addStretch(1)  # Add this line to stretch the result_edit widget

        main_layout = QHBoxLayout()
        main_layout.addLayout(input_layout)
        main_layout.addLayout(button_layout)
        main_layout.addLayout(result_layout)

        self.setLayout(main_layout)

    def add(self):
        try:
            num1 = float(self.num1_edit.text())
            num2 = float(self.num2_edit.text())
            result = num1 + num2
            self.result_edit.setText(str(result))
        except ValueError:
            self.result_edit.setText('Invalid Input')

    def subtract(self):
        try:
            num1 = float(self.num1_edit.text())
            num2 = float(self.num2_edit.text())
            result = num1 - num2
            self.result_edit.setText(str(result))
        except ValueError:
            self.result_edit.setText('Invalid Input')

    def multiply(self):
        try:
            num1 = float(self.num1_edit.text())
            num2 = float(self.num2_edit.text())
            result = num1 * num2
            self.result_edit.setText(str(result))
        except ValueError:
            self.result_edit.setText('Invalid Input')

    def divide(self):
        try:
            num1 = float(self.num1_edit.text())
            num2 = float(self.num2_edit.text())
            if num2 == 0:
                self.result_edit.setText('Division by zero')
            else:
                result = num1 / num2
                self.result_edit.setText(str(result))
        except ValueError:
            self.result_edit.setText('Invalid Input')

    def clear(self):
        self.num1_edit.clear()
        self.num2_edit.clear()
        self.result_edit.clear()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = CalculatorApp()
    window.show()
    sys.exit(app.exec_())

This code creates a simple calculator application using PyQt. It has three input fields (for two numbers and result display), labels, and buttons for performing basic arithmetic operations. When you click the operation buttons, it calculates the result and displays it in the third input field.

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