51单片机超声波测距

unsigned char disbuff[4] ={ 0,0,0,0,};

if((S>=4000)||flag==1) //超出测量范围显示“ERR0”
{
flag=0;
disbuff[0]=0x3f; //“-”
disbuff[1]=0x50; //“-”
disbuff[2]=0x50; //“-”
disbuff[3]=0x79; //“-”
}
else
{
disbuff[3]=DIG_CODE[S%10000/1000];
disbuff[2]=DIG_CODE[S%1000/100];
disbuff[1]=DIG_CODE[S%100/10];
disbuff[0]=DIG_CODE[S%10/1];
}