相当于Julia中的R's dput

show(io::IO, x)

# 打印整数
x = 42
show(stdout, x)  # 输出：42

# 打印字符串
s = "Hello, Julia!"
show(stdout, s)  # 输出："Hello, Julia!"

# 打印数组
a = [1, 2, 3]
show(stdout, a)  # 输出：[1, 2, 3]

# 自定义类型
struct Point
    x::Float64
    y::Float64
end

p = Point(1.0, 2.0)
show(stdout, p)  # 输出："Point(1.0, 2.0)"