基于51单片机的计算器小数点不知道该怎么写程序求帮助 -

#include<reg52.h>
#include<math.h>
#define uint unsigned int
#define uchar unsigned char
sbit rs = P2^0;
sbit rw = P2^1;
sbit lcden = P2^2;
uchar code anjian[]={ //键盘值
'A','(',')','B','C',
'7','8','9','/','D',
'4','5','6','*','E',
'1','2','3','-','F',
'G','0','.','+','='
};
uchar code shuzhi[]={
'0','1','2','3','4',
'5','6','7','8','9'
};
double num[20]; //储存数值
double value; //储存结果
char flag; //运算符判断
uchar KeyValue = 30; //按键值
void delay(uint z) //毫秒级延时
{
uint x,y;
for(x=z;x>0;x--)
for(y=114;y>0;y--);
}
/*********************** 定时器0初始化 ***********************/
//void Init_timer0()
//{
// EA = 1;
// ET0 = 1;
// TR0 = 1;
// TMOD = 0x01;
// TH0 = 0xED; //定时5ms
// TL0 = 0xFF;
//}
/*********************** 5*5矩阵键盘 ***********************/
void KeyScan()
{
P3 = 0xFF; //列扫描
P1 = 0;
while(KeyValue == 30)
{
if(P3 != 0xFF)
{
delay(10);
if(P3 != 0xFF)
{
switch(P3)
{
case 0xFE: KeyValue=0; break;
case 0xFD: KeyValue=1; break;
case 0xFB: KeyValue=2; break;
case 0xF7: KeyValue=3; break;
case 0xEF: KeyValue=4; break;
}
P1 = 0xFF; //行扫描
P3 = 0;
switch(P1)
{
case 0xF7: KeyValue=KeyValue; break;
case 0xEF: KeyValue=KeyValue+5; break;
case 0xDF: KeyValue=KeyValue+10; break;
case 0xBF: KeyValue=KeyValue+15; break;
case 0x7F: KeyValue=KeyValue+20; break;
}
while(P1 != 0xFF); //松手检测
}
}
}
}
/*********************** LCD1602 ***********************/
void Read_Busy() //判忙函数
{
uchar busy;
P0 = 0xFF;
rs = 0;
rw = 1;
do
{
lcden = 1;
busy = P0;
lcden = 0;
}while(busy & 0x80);
}
void Write_Cmd(uchar cmd) //写指令
{
Read_Busy();
rs = 0;
rw = 0;
P0 = cmd;
lcden = 1;
lcden = 0;
}
void Write_Dat(uchar dat) //写数据
{
Read_Busy();
rs = 1;
rw = 0;
P0 = dat;
lcden = 1;
lcden = 0;
KeyValue = 30; //清按键值
}
void Init_lcd() //lcd初始化
{
Write_Cmd(0x38); //16*2显示
Write_Cmd(0x0C); //开显示
Write_Cmd(0x01); //清屏
Write_Cmd(0x06); //读写一字节后，地址指针加1
}
/*********************** 获取数值 ***********************/
void GetNum(int x)
{
num[x] = anjian[KeyValue] - 48;
Write_Dat(anjian[KeyValue]);
KeyScan();
while(48 <= anjian[KeyValue] && anjian[KeyValue] <= 57)
{
num[x] = num[x] * 10 + (anjian[KeyValue] - 48);
Write_Dat(anjian[KeyValue]);
KeyScan();
}
}
/*********************** 运算符号 ***********************/
void GetFlag()
{
switch(anjian[KeyValue])
{
case '+':
flag = '+';
Write_Dat('+'); break;
case '-':
flag = '-';
Write_Dat('-'); break;
case '*':
flag = '*';
Write_Dat('*'); break;
case '/':
flag = '/';
Write_Dat('/'); break;
}
KeyScan();
GetNum(1);
}
/*********************** 计算结果 ***********************/
void calculate()
{
int ge, shi, bai;
Write_Cmd(0xC0);
Write_Dat('=');
switch(flag)
{
case '+':
value = num[0] + num[1]; break;
case '-':
value = num[0] - num[1]; break;
case '*':
value = num[0] * num[1]; break;
case '/':
value = num[0] / num[1]; break;
}
if(0 <= fabs(value) && fabs(value) <= 9) //1位数
{
ge = fabs(value);
if(value >= 0)
Write_Dat(shuzhi[ge]);
else
{
Write_Dat('-');
Write_Dat(shuzhi[ge]);
}
}
if(10 <= fabs(value) && fabs(value) <= 99) //2位数
{
shi = fabs(value) / 10;
ge = (int)fabs(value) % 10;
if(value >= 0)
{
Write_Dat(shuzhi[shi]);
Write_Dat(shuzhi[ge]);
}
else
{
Write_Dat('-');
Write_Dat(shuzhi[shi]);
Write_Dat(shuzhi[ge]);
}
}
if(100 <= fabs(value) && fabs(value) <= 999) //3位数
{
bai = fabs(value) / 100;
shi = (int)fabs(value) /10 % 10;
ge = (int)fabs(value) % 10;
if(value >= 0)
{
Write_Dat(shuzhi[bai]);
Write_Dat(shuzhi[shi]);
Write_Dat(shuzhi[ge]);
}
else
{
Write_Dat('-');
Write_Dat(shuzhi[bai]);
Write_Dat(shuzhi[shi]);
Write_Dat(shuzhi[ge]);
}
}
}
void main()
{
//Init_timer0();
Init_lcd();
Write_Cmd(0x80); //第一行显示字符
while(1)
{
KeyScan();
if(48 <= anjian[KeyValue] && anjian[KeyValue] <= 57) //获取0~9数值
GetNum(0);
if(anjian[KeyValue] == '=')
calculate();
else
GetFlag();
}
}
/*********************** T0中断函数 ***********************/
//void timer0() interrupt 1
//{
// TH0 = 0xED; //定时5ms
// TL0 = 0xFF;
//
// if(anjian[KeyValue] == 'A')
// {
// Write_Cmd(0x01); //清屏
// Write_Cmd(0x80); //第一行显示字符
// //KeyValue = 0;
// }
//}

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