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代碼：
#include <reg51.h>
#include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
unsigned char table[]={0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
unsigned char pos[]={0x00, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
uint num[10];
uint cnt,flag,num1,num2,op,st;
unsigned long res;
uint col,row;
/*--------------?óê±10ms×ó3ìDò---------*/
void delay10ms(void)
{
unsigned int TempCyc = 5552*2;
while(TempCyc--);
}
void update()
{
cnt = 1;
num[cnt] = res % 10;
for (;;)
{
if (res>10)
{
res = res/10;
cnt++;
num[cnt] = res % 10;
}
else
break;
}
st = 1;
}
void delay(unsigned int k)
{
unsigned int j;
for (j=0; j<k; j++)
{}
}
void main(void)
{
uchar keyval;
uint i;
cnt = 0;
flag = 0;
num1 = 0;
num2 = 0;
op = 0;
st = 0;
for (;;)
{
P1 = 0xf0;
keyval = 0xf0;
if ((P1&0xf0) != 0xf0)
{
if (st != 0)
{
st = 0;
cnt = 0;
}
keyval = P1^0xf0;
switch (keyval) //col
{
case (0x10):
col = 1;
break;
case (0x20):
col = 2;
break;
case (0x40):
col = 3;
break;
case (0x80):
col = 4;
break;
}
delay10ms();
P1 = 0x0f;
keyval = P1^0x0f;
switch (keyval)
{
case (0x01):
row = 1;
break;
case (0x02):
row = 2;
break;
case (0x04):
row = 3;
break;
case (0x08):
row = 4;
break;
}
if ((col<4 && row<4)) //1~9
{
cnt++;
if (flag == 0)
{
num1 = num1*10 + 9 - 3*row + col;
num[cnt] = 9 - 3*row + col;
}
else
{
num2 = num2*10 + 9 - 3*row + col;
num[cnt] = 9 - 3*row + col;
}
}
if (row == 4 && col == 1) //0
{
if (cnt!=0)
cnt++;
if (flag == 0)
{
num1 = num1*10;
if (cnt != 0)
num[cnt] = 0;
}
else
{
num2 = num2*10;
if (cnt != 0)
num[cnt] = 0;
}
}
if (row == 4 && col == 2) //C
{
cnt = 0;
flag = 0;
num1 = 0;
num2 = 0;
op = 0;
}
if (col == 4) //option
{
flag = 1;
cnt = 0;
op = row;
}
if (row == 4 && col == 3) //=
{
switch (op)
{
case (1):
res = num1+num2;
update();
break;
case (2):
res = num1-num2;
update();
break;
case (3):
res = num1*num2;
update();
break;
case (4):
res = (num1*10/num2+5)/10;
update();
break;
}
flag = 0;
num1 = 0;
num2 = 0;
op = 0;
}
P1 = 0xf0;
while((P1&0xf0)!=0xf0);
}
P2 = 0x00;
for (i = 1; i <=cnt; i++)
{
P2 = pos[i];
if (st == 0)
P0 = table[num[cnt-i+1]];
else
P0 = table[num[i]];
delay(300);
}
}
while (1)
;
}
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