#基于51单片机的简易计算器

基于51单片机的简易计算器
/**************************************************************** 阿斌独家制作:
计算器数码管显示
可计算10以下数加减乘除
可连续运算最大显示结果数值9999
*****************************************************************/ 键盘设置：
主程序：
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar num,temp,jia=0,jian=0,cheng=0,chu=0,qing=0;
uint key,key1;
uchar table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x0};
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void keyscan()
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:key=1;num=0;break;
case 0xde:key=2;num=0;break;
case 0xbe:key=3;num=0;break;
case 0x7e:num=1;break; //加号}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
{
case 0xed:key=4;num=0;break;
case 0xdd:key=5;num=0;break;
case 0xbd:key=6;num=0;break;
case 0x7d:num=2;break; //减号}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
{
temp=P3;
switch(temp)
{
case 0xeb:key=7;num=0;break;
case 0xdb:key=8;num=0;break;
case 0xbb:key=9;num=0;break;
case 0x7b:num=3;break; //乘号}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:key=0;num=0;break;
case 0xd7:num=6;break; //清除
case 0xb7:num=5;break; //等于号
case 0x77:num=4;break; //除号}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
}
void display(uint shu)
{
uint qian,bai,shi,ge;
qian=shu/1000;
bai=shu%1000/100;
shi=shu%100/10;
ge=shu%10;
P2=0x1f;
if(qian==0)
P0=table[10];
else
P0=table[qian];
delay(5);
P2=0x2f;
if(qian==0&&bai==0)
P0=table[10];
else
P0=table[bai];
delay(5);
P2=0x4f;
if(qian==0&&bai==0&&shi==0) P0=table[10];
else
P0=table[shi];
delay(5);
P2=0x8f;
P0=table[ge];
delay(5);
}
void jia1()
{
jia=1;
jian=cheng=chu=qing=0;
key1=key;
}
void jian1()
{
jian=1;
jia=cheng=chu=qing=0;
key1=key;
}
void cheng1()
{
cheng=1;
jia=jian=chu=qing=0;
key1=key;
}
void chu1()
{
chu=1;
jia=jian=cheng=qing=0;
key1=key;
}
void qing1()
{
qing=1;
jia=jian=cheng=chu=0;
key1=key=0;
}
void deng1()
{
if(jia)
key=key1+key;
if(jian)
key=key1-key;
if(cheng)
key=key1*key;
if(chu)
key=key1/key;
display(key);
jia=jian=cheng=chu=qing=0; }
void deal()
{
switch(num)
{
case 0: display(key);break;
case 1: jia1();break;
case 2: jian1();break;
case 3: cheng1();break;
case 4: chu1();break;
case 5: deng1();break;
case 6: qing1();break;
}
}
void main()
{
P2=0x0f;
while(1)
{
keyscan();
deal();
}
}
11。