KEIL UV3 怎么算错了？

1万 · 2013-9-2 15:20

   uchar dti; //当前
uchar sta; //起始
uchar sto; //结束

date_time[2]  = 0x12; ////当前
star_time[2]  = 0x18; ////起始
stop_time[2]  = 0x08; ////结束
//16进制转10进制
sta = (star_time[2]&0xf0)>>4;
sto = (stop_time[2]&0xf0)>>4;
dti = (date_time[2]&0xf0)>>4;

sta= sta*10+star_time[2]&0x0f; //执行后，sta=0x02 ?
sto= sto*10+stop_time[2]&0x0f;
dti= dti*10+date_time[2]&0x0f;

ps: keil uv3 for51, 优化默认8，模拟运行出现的现象