2024.11.22

## Ex 5-1. QPushButton.

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout, QGridLayout


class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.n1 = int(0)
        self.n2 = int(0)
        self.a = int(0)
    def initUI(self):
        grid = QGridLayout()
        self.setLayout(grid)

        btn1 = QPushButton(self)
        btn1.setText('1')
        btn1.clicked.connect(self.clickBtn1)
        grid.addWidget(btn1, 2, 0)

        btn2 = QPushButton(self)#2
        btn2.setText('2')
        btn2.clicked.connect(self.clickBtn2)
        grid.addWidget(btn2, 2, 1)

        btn3 = QPushButton(self)#3
        btn3.setText('3')
        btn3.clicked.connect(self.clickBtn3)
        grid.addWidget(btn3, 2, 2)

        btn4 = QPushButton(self)#4
        btn4.setText('4')
        btn4.clicked.connect(self.clickBtn4)
        grid.addWidget(btn4, 1, 0)

        btn5 = QPushButton(self)#5
        btn5.setText('5')
        btn5.clicked.connect(self.clickBtn5)
        grid.addWidget(btn5, 1, 1)

        btn6 = QPushButton(self)#6
        btn6.setText('6')
        btn6.clicked.connect(self.clickBtn6)
        grid.addWidget(btn6, 1, 2)

        btn7 = QPushButton(self)#7
        btn7.setText('7')
        btn7.clicked.connect(self.clickBtn7)
        grid.addWidget(btn7, 0, 0)

        btn8 = QPushButton(self)#8
        btn8.setText('8')
        btn8.clicked.connect(self.clickBtn8)
        grid.addWidget(btn8, 0, 1)

        btn9 = QPushButton(self)#9
        btn9.setText('9')
        btn9.clicked.connect(self.clickBtn9)
        grid.addWidget(btn9, 0, 2)

        btn0 = QPushButton(self)#0
        btn0.setText('0')
        btn0.clicked.connect(self.clickBtn0)
        grid.addWidget(btn0, 3, 1)

        btnP = QPushButton(self)#+
        btnP.setText('+')
        btnP.clicked.connect(self.clickBtnP)
        grid.addWidget(btnP, 2, 3)

        btnM = QPushButton(self)#-
        btnM.setText('-')
        btnM.clicked.connect(self.clickBtnM)
        grid.addWidget(btnM, 1, 3)

        btnE = QPushButton(self)#=
        btnE.setText('=')
        btnE.clicked.connect(self.clickBtnE)
        grid.addWidget(btnE, 3, 3)

        btnC = QPushButton(self)#clear
        btnC.setText('CE')
        btnC.clicked.connect(self.clickBtnC)
        grid.addWidget(btnC, 0, 3)

        vbox = QVBoxLayout()

        self.setLayout(vbox)
        self.setWindowTitle('Calculator')
        self.setGeometry(300, 300, 300, 200)
        self.show()

    def clickBtn1(self):
        print(1, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 1
        else:
            self.n2 = self.n2 * 10 + 1
    def clickBtn2(self):
        print(2, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 2
        else:
            self.n2 = self.n2 * 10 + 2
    def clickBtn3(self):
        print(3, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 3
        else:
            self.n2 = self.n2 * 10 + 3
    def clickBtn4(self):
        print(4, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 4
        else:
            self.n2 = self.n2 * 10 + 4
    def clickBtn5(self):
        print(5, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 5
        else:
            self.n2 = self.n2 * 10 +5
    def clickBtn6(self):
        print(6, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 6
        else:
            self.n2 = self.n2 * 10 + 6
    def clickBtn7(self):
        print(7, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 7
        else:
            self.n2 = self.n2 * 10 + 7
    def clickBtn8(self):
        print(8, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 8
        else:
            self.n2 = self.n2 * 10 + 8
    def clickBtn9(self):
        print(9, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10 + 9
        else:
            self.n2 = self.n2 * 10 + 9
    def clickBtn0(self):
        print(0, end='')
        if self.a == 0:
            self.n1 = self.n1 * 10
        else:
            self.n2 = self.n2 * 10
    def clickBtnP(self):
        print('+', end='')
        self.a = 1
    def clickBtnM(self):
        print('-', end='')
        self.a = 3
    def clickBtnE(self):
        print('=', end='')
        if self.a == 1:
            print(self.n1 + self.n2, end='')
            self.n1 += self.n2
        elif self.a == 3:
            print(self.n1 - self.n2, end='')
            self.n1 -= self.n1
        self.n2 = 0
    def clickBtnC(self):
        print('')
        self.n1 = 0
        self.n2 = 0
        self.a = 0
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MyApp()
    sys.exit(app.exec_())