import tkinter as tk
from tkinter import messagebox
class Calculator:
def __init__(self, master):
self.master = master
master.title("简单计算器")
# 创建输入框
self.entry = tk.Entry(master, width=20, font=("Arial", 16))
self.entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)
# 创建按钮
self.create_button("7", 1, 0)
self.create_button("8", 1, 1)
self.create_button("9", 1, 2)
self.create_button("+", 1, 3)
self.create_button("4", 2, 0)
self.create_button("5", 2, 1)
self.create_button("6", 2, 2)
self.create_button("-", 2, 3)
self.create_button("1", 3, 0)
self.create_button("2", 3, 1)
self.create_button("3", 3, 2)
self.create_button("*", 3, 3)
self.create_button("0", 4, 0)
self.create_button(".", 4, 1)
self.create_button("=", 4, 2)
self.create_button("/", 4, 3)
# 创建清空按钮
self.create_button("C", 5, 0, columnspan=2)
self.create_button("DEL", 5, 2, columnspan=2)
def create_button(self, text, row, column, columnspan=1):
button = tk.Button(self.master, text=text, width=5, height=2, font=("Arial", 16), command=lambda: self.on_button_click(text))
button.grid(row=row, column=column, columnspan=columnspan, padx=5, pady=5)
def on_button_click(self, text):
if text == "=":
try:
result = eval(self.entry.get())
self.entry.delete(0, tk.END)
self.entry.insert(tk.END, str(result))
except:
messagebox.showerror("错误", "输入有误")
elif text == "C":
self.entry.delete(0, tk.END)
elif text == "DEL":
self.entry.delete(len(self.entry.get())-1, tk.END)
else:
self.entry.insert(tk.END, text)
root = tk.Tk()
calculator = Calculator(root)
root.mainloop()
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