51单片机控制的超声波测距程序问题,为什么num一直为0#include#define uint unsigned intsbit RST= P1^1;sbit start=P1^2;sbit Pled1= P2^0;sbit Pled2= P2^1;uint num;\x05\x05\x05\x05 //num一个数值代表0.05msvoid DetectScanf();void mai

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