有一个长方体，它的高已经给出，然后输入这个长方体的长和宽，通过输入的长、宽以及给定的高度，计算出这个长方体的体积。-There is a cuboid, it has been given a high, and then enter the length and width of the cuboid by length, width and height of a given input, calculate the volume of the cuboid.