例如：key=~P0&0x0f;if(key!=0) P2=key;

例如：key=~P0&0x0f;if(key!=0) P2=key; char key() { return((P0&0x0f)==0x0f)?0:(P0&0x0f); 单片机程序key=~p0&0x0f;中的“~”符号表示啥意思 P0=counter&0x0f怎么理解counter是一个变量 counter&=0x0f;是什么意思? #define LCD_data P0 //数据口能这样定义吗,列：LCD_data =0x0f,即P0=0xf0?是这样吗,但是连接时显示LCD_data =0x0f这个语句12864A-3.C(268):error C213:left side of asn-op not an lvalue TR0=1; temp=temp & 0x0f; while(temp!=0x0f) { temp=P3; temp=temp & 0x0f; } TR0=0;#include unsigned char temp;unsigned char key;unsigned char i,j;unsigned char STH0;unsigned char STL0;sbit P1_0=P1^0;sbit P3_4=P3^4;sbit P3_5=P3^5;sbit P3_6=P3^6;sbit P3_ if($_SESSION[key]==0)是什么意思? P0=P0|0x80是什么意思 c语言的 temp=temp^0x0f是什么意思. if(++Time_Count = 50) return;中的return怎么理解?//#include #define uint unsigned int#define uchar unsigned charsbit RED_A = P0^0;sbit YELLOW_A = P0^1;sbit GREEN_A = P0^2;sbit RED_B = P0^3;sbit YELLOW_B = P0^4;sbit GREEN_B = P0^5;uchar Time_Coun P0=p0 一道matlab不动点迭代求高手指点function [k,p,err]=fixpt(g,p0)P(1)=p0;tol=1.e-8;max1=50;for k=2:max1P(k)=feval(g,P(k-1));err=abs(P(k)-P(k-1));relerr=err/(abs(P(k))+eps);p=P(k);if(err num[]={0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff,0x7f,0x3f,0x1f,0x0f,0x07,0x03,0x01,51单片机P0口接8各不同阻值的电阻,输出16分段的正弦波num[]={0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff,0x7f,0x3f,0x1f,0x0f,0x07,0x03,0x01,0x00};.P0 =num[ P0=0x00是什么意思 if $key%2==1 请问这个if语句什么意思?if( (key&0x1) ) main() {int k=0; while(printf(*)) {k++; if(k