Drawa UMLdiagram first编写和测试vector2d定义加法，减法，数量积，输入和输出操作符一类，和两个二维向量的内积。
Write and test a class Vector2D to define operators for addition, subtraction, scalar product, input and output, and inner product of two 2d vectors.
Drawa UMLdiagram first编写和测试vector2d定义加法，减法，数量积，输入和输出操作符一类，和两个二维向量的内积。
Write and test a class Vector2D to define operators for addition, subtraction, scalar product, input and output, and inner product of two 2d vectors.
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