51单片机简易计算器(单片机小实验，含C程序和Ptotues电路图)-凡亿问答

51单片机简易计算器仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）

单片机源程序如下:

#include"reg52.h"
#include"math.h"
#define uchar unsigned char
#define uint unsigned int
#define key P3
#define duan P2
#define wei P1
sbit led=P0^0;
sbit buzzer=P0^1;
uchar num,temp,num1,i=0;
long bczs=0,czs=0,jiguo=0,jiguo1=0;
uchar czs12=1; //输入数的选择标志位，１为第一个数，２为第二个数
uchar yiweiflag,qinflag; //移位标志
uchar code shuzi[12]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xbf}; //0~9,-,
uchar code weizi[9]={0x00,0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
uchar code error[10]={0xff,0xaf,0xc0,0xaf,0xaf,0x86,0xff,0xff,0xff};//error
uchar playshuzu[9],fuhao;
uchar zhi,weishu=0;
void init(); //函数申明
uchar keyscan();
uchar scanzhi();
void display();
void duzhichuli();
void zhuandisplayjiguo();
void jiafa();
void jianfa();
void chengfa();
void chufa();
void qin();
void displayerror();
//======================================
void main() //主函数
{
init();
display();
while(1)
{
duzhichuli();
}
}
//===============================================================================
void init()
{
uchar i;
czs12=1;
yiweiflag=1; //１不移
qinflag=0; //不清除
duan=shuzi[8];
wei=weizi[5];
playshuzu[1]=shuzi[0];
for(i=2;i<9;i++)
playshuzu[i]=shuzi[10];
bczs=0;czs=0;jiguo=0,jiguo1=0;
}
//===============================================================================
void delay(uint x)
{
uchar y;
for(x;x>0;x--)
for(y=112;y>0;y--);
}
//====================================
uchar keyscan()
{
unsigned char recode,i,j;
for(i=0;i<4;i++)
{
P3=~(0x01<
recode=P3>>4;
if(recode<0x0f)
{
for(j=0;j<4;j++)
{if(!(recode&0x01<
return (i<<2)+(j+1); //返回键值 1-16
}
delay(5); //延时5ms
}
return 0; //无按键返回
}
//========================================
uchar scanzhi()
{
uchar zhi,k;
k=keyscan();
switch(k)
{
case 0: zhi=27;break;
case 1: zhi=7;break;
case 2: zhi=8;break;
case 3: zhi=9;break;
case 4: zhi=24;break; // /
case 5: zhi=4;break;
case 6: zhi=5;break;
case 7: zhi=6;break;
case 8: zhi=23;break; //*
case 9: zhi=1;break;
case 10: zhi=2;break;
case 11: zhi=3;break;
case 12: zhi=22;break; //-
case 13: zhi=26;break; //nc
case 14: zhi=0;break;
case 15: zhi=25;break; //=
case 16: zhi=21;break; //+
}
return(zhi);
}
//===========================================
void duzhichuli()
{
uchar tt,u;
tt=scanzhi();
if(tt!=27)
{
led=0;
buzzer=0;
if(tt<=9)//数字输入
{
if(qinflag==1) qin();
qinflag=0;
if(yiweiflag!=1)
{
for(u=8;u>1;u--) //移位输入
{
playshuzu[u]=playshuzu[u-1];
}
}
yiweiflag=0; //移位
playshuzu[1]=shuzi[tt];
if(czs12==1) bczs=bczs*10+tt; //
if(czs12==2) czs=czs*10+tt;
}
if(tt>20)//符号输入
{
switch(tt)
{
case 21: jiafa();break; //+
case 22: jianfa();break; //-
case 23: chengfa();break; //*
case 24: chufa();break;
case 25: zhuandisplayjiguo();break; //=
case 26: init();break; //nc
}
}
}
//-----------------------------------------------
while(tt!=27) //松手检测
{
led=0;
buzzer=0;
tt=scanzhi();
delay(1);
if(tt==27) goto chu;
}
chu: delay(1);
led=1;
buzzer=1;
}
//============================================
void display()
{
TMOD=0x01;
TH0=(65536-200)/256;
TL0=(65536-200)%256;
EA=1;
ET0=1;
TR0=1;
}
void TIME0(void) interrupt 1
{
TH0=(65536-200)/256;
TL0=(65536-200)%256;
i++;
if(i==9) i=1;
wei=weizi[i];
duan=playshuzu[i];
}
//=============================================== //显示数转操作数
void zhuandisplayjiguo()
{
uchar i,k;
long ttt;
for(i=1;i<9;i++)
playshuzu[i]=shuzi[10];
//----------------------------------------
switch(fuhao)
{
case 1: jiguo=bczs+czs;break;
case 2: jiguo=bczs-czs;break;
case 3: jiguo=bczs*czs;break;
case 4: jiguo=bczs/czs;break;
case 0: jiguo=jiguo1;break;
}
fuhao=0;
//----------------------------------------
ttt=jiguo;
jiguo1=jiguo; //显示处理
k=1; //取数的个数
for(i=1;i<=8;i++)
{
if(ttt/10!=0) k++;
ttt=ttt/10;
}
for(i=8;i>k;i--)
{
playshuzu[i]=shuzi[10];
}
if(jiguo<0) { jiguo=fabs(jiguo);playshuzu[k+1]=shuzi[11]; } //取正加负号
for(i=1;i<=k;i++)
{
playshuzu[i]=shuzi[jiguo%10];
jiguo=jiguo/10;
}
if(jiguo1>99999999) displayerror();
}
//===================================================
void qin()
{
uchar i;
yiweiflag=1; //１不移
playshuzu[1]=shuzi[0];
for(i=2;i<9;i++)
playshuzu[i]=shuzi[10];
}
//===================================================
void displayerror()
{
uchar i;
for(i=1;i<=8;i++)
playshuzu[i]=error[i];
}
//===================================================
void jiafa() //+
{
qinflag=1;
if(jiguo1!=0) bczs=jiguo1;
czs=0;
czs12=2;
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