浮点数和usleep问题
我正在编写有这段代码的应用程序，其中 t->tick 是 float:
usleep(1000);
t->tick = t->tick + 0.001;
printf("tick is %f, firing time is %f\n", t->tick, t->firing_time);
我发现 usleep 中有错误？:
tick is 0.313000, firing time is 2.000000
tick is 0.314000, firing time is 2.000000
tick is 0.314999, firing time is 2.000000
tick is 0.315999, firing time is 2.000000
如何摆脱该错误？
Im wrinting app which has that piece of code, where t->tick is float:
usleep(1000);
t->tick = t->tick + 0.001;
printf("tick is %f, firing time is %f\n", t->tick, t->firing_time);
i found that there is error in usleep?:
tick is 0.313000, firing time is 2.000000
tick is 0.314000, firing time is 2.000000
tick is 0.314999, firing time is 2.000000
tick is 0.315999, firing time is 2.000000
How to get rid of that error ?
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评论（2）
没有错误，你只是不明白二进制浮点数学是如何工作的。
There's no error, you simply do not understand how binary floating-point math works.
看起来像 printf 中的舍入稳定性错误。
尝试： printf("tick 为 %.3f，触发时间为 %.3f\n", t->tick, t->firing_time);
Looks like a rounding stability error in printf.
Try: printf("tick is %.3f, firing time is %.3f\n", t->tick, t->firing_time);