有没有理由在c中写这样的for-loop？(第一个语句留空,高度设置在外面而且......高度变量在其他地方之后也没用过)
lastheight = halfheight;
.
. // some more code changing height, includes setting
. // lastheight
. // to something that is essentially the height of a wall
.
height = halfheight;
for ( ; lastheight < height ; lastheight++)
它是从Wolfenstein3D源代码中引用的.