基于AT89C1单片机C语言编写的计算器

#include

#define uint unsigned int

#define uchar unsigned char

sbit dula=P2^6;

sbit wela=P2^7;

sbit key1=P3^4;

uchar code table[]={

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71,0};

uchar num,temp,num1;

void delay(uint z)

{

uint x,y;

for(x=z;x>0;x--)

for(y=110;y>0;y--);

}

uchar keyscan();

void display(uchar aa);

void main()

{

num=17;

dula=1;

P0=0;

dula=0;

wela=1;

P0=0xc0;

wela=0;

while(1)

{

display(keyscan());

}

}

void display(uchar aa)

{

dula=1;

P0=table[aa-1];

dula=0;

}

uchar 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:num=1;

break;

case 0xde:num=2;

break;

case 0xbe:num=3;

break;

case 0x7e:num=4;

break;

}

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;

switch(temp)

{

case 0xed:num=5;

break;

case 0xdd:num=6;

break;

case 0xbd:num=7;

break;

case 0x7d:num=8;

break;

}

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;

while(temp!=0xf0)

{

temp=P3;

switch(temp)

{

case 0xeb:num=9;

break;

case 0xdb:num=10;

break;

case 0xbb:num=11;

break;

case 0x7b:num=12;

break;

}

while(temp!=0xf0)

{

temp=P3;

temp=temp&0xf0;

}

}

}

P3=0xf7;

temp=P3;

temp=temp&0xf0;

while(temp!=0xf0)

{

del