要写简洁的程序就这样三个语句实现了：
float x_min=0,x_max=0,level_1=0;
(level_1=GetTagFloat("level_1")) < (x_min=GetTagFloat("x_min_1")) ? (SetTagFloat("x_min_1",level_1)) : (SetTagFloat("x_min_1",x_min));
(level_1=GetTagFloat("level_1")) > (x_man=GetTagFloat("x_man_1")) ? (SetTagFloat("x_man_1",level_1)) : (SetTagFloat("x_man_1",x_man));