如何获取并理解科学计算器的源代码？

科学计算器源码涉及多种编程语言，如C、Java、Python等。具体实现包括输入处理、运算符优先级、函数支持等功能。

import math
def add(x, y):
    return x + y
def subtract(x, y):
    return x  y
def multiply(x, y):
    return x * y
def divide(x, y):
    if y == 0:
        raise ValueError("除数不能为0")
    return x / y
def square(x):
    return x ** 2
def sqrt(x):
    if x < 0:
        raise ValueError("负数没有平方根")
    return math.sqrt(x)
def exponent(x, y):
    return x ** y
def logarithm(x, base=math.e):
    if x <= 0:
        raise ValueError("对数的底数必须大于0")
    return math.log(x, base)
def calculator():
    print("请选择操作：")
    print("1.加法")
    print("2.减法")
    print("3.乘法")
    print("4.除法")
    print("5.平方")
    print("6.开方")
    print("7.指数")
    print("8.对数")
    choice = input("请输入操作序号(1/2/3/4/5/6/7/8): ")
    if choice in ('1', '2', '3', '4'):
        num1 = float(input("请输入第一个数字： "))
        num2 = float(input("请输入第二个数字： "))
        if choice == '1':
            print(num1, "+", num2, "=", add(num1, num2))
        elif choice == '2':
            print(num1, "", num2, "=", subtract(num1, num2))
        elif choice == '3':
            print(num1, "*", num2, "=", multiply(num1, num2))
        elif choice == '4':
            try:
                print(num1, "/", num2, "=", divide(num1, num2))
            except ValueError as e:
                print(e)
    elif choice in ('5', '6', '7', '8'):
        num = float(input("请输入一个数字： "))
        if choice == '5':
            print(num, "的平方是", square(num))
        elif choice == '6':
            try:
                print("√", num, "=", sqrt(num))
            except ValueError as e:
                print(e)
        elif choice == '7':
            exp = float(input("请输入指数： "))
            print(num, "的", exp, "次方是", exponent(num, exp))
        elif choice == '8':
            base = float(input("请输入对数的底数（默认为自然常数e）： ") or math.e)
            try:
                print("以", base, "为底", num, "的对数是", logarithm(num, base))
            except ValueError as e:
                print(e)
    else:
        print("无效输入")
if __name__ == "__main__":
    calculator()

将以上代码复制到一个名为calculator.py的文件中，然后在命令行中运行python calculator.py即可启动科学计算器。