求助,为什么计算器无法正确仿真 -

#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit lcden=P1^1;
sbit rs=P1^0;
sbit rw=P1^2;
sbit busy=P0^7;
char i,j,temp,num,num_1;
long a,b,c;
float a_c,b_c;
uchar flag,fuhao;
uchar code table[]={
7,8,9,0,
4,5,6,0,
1,2,3,0,
0,0,0,0};
uchar code table1[]={
7,8,9,0x2f-0x30,
4,5,6,0x2a-0x30,
1,2,3,0x2d-0x30,
0x01-0x30,0,0x3d-0x30,0x2b-0x30
};
void delay(uchar z)
{
uchar y;
for(z;z>0;z--)
for(y=0;y<110;y++);
}
void write_com(uchar com)
{
rs=0;
P0=com;
delay(5);lcden=1;delay(5); lcden=0;
}
void write_date(uchar date)
{
rs=1; P0=date; delay(5);
lcden=1; delay(5); lcden=0;
}
void init()
{
num=-1;
lcden=1;
rw=0;
write_com(0x38);
delay(5); write_com(0x38);
delay(5); write_com(0x0c);
delay(1); write_com(0x06);
delay(1); write_com(0x80);
delay(1); write_com(0x01);
num_1=0;
i=0; j=0;
a=0;
b=0;
c=0;
flag=0;
fuhao=0;
}
void keyscan()
{
P2=0xfe;
if(P2!=0xfe)
{
delay(20);
if(P2!=0xfe) { temp=P2&0xf0;
switch(temp)
{
case 0xe0:num=0; break; //7
case 0xd0:num=1; break; //8
case 0xb0:num=2; break; //9
case 0x70:num=3; break;
}
} while(P2!=0xfe);
if(num==0||num==1||num==2)
{
if(j!=0){write_com(0x01); j=0; }
if(flag==0)
{ a=a*10+table[num]; }
else
{ b=b*10+table[num]; }
}
else
{
flag=1;
fuhao=4;
}
i=table1[num];
write_date(0x30+i);
}
P2=0xfd;
if(P2!=0xfd)
{
delay(20);
if(P2!=0xfd){ temp=P2&0xf0;
switch(temp)
{
case 0xe0:num=4; break; //4
case 0xd0:num=5; break; //5
case 0xb0:num=6; break; //6
case 0x70:num=7; break; //¡á
}
} while(P2!=0xfd);
if(num==4||num==5||num==6&&num!=7)
{
if(j!=0){ write_com(0x01); j=0; }
if(flag==0)
{ a=a*10+table[num]; }
else
{ b=b*10+table[num]; }
}
else
{ flag=1;
fuhao=3;
}
i=table1[num];
write_date(0x30+i);
}
P2=0xfb;
if(P2!=0xfb){ delay(20);
if(P2!=0xfb) { temp=P2&0xf0;
switch(temp)
{
case 0xe0:num=8; break; //1
case 0xd0:num=9; break; //2
case 0xb0:num=10; break; //3
case 0x70:num=11; break; //-
}
} while(P2!=0xfb);
if(num==8||num==9||num==10)
{
if(j!=0){ write_com(0x01); j=0; }
if(flag==0)
{ a=a*10+table[num]; }
else
{ b=b*10+table[num]; }
}
else if(num==11)
{
flag=1;
fuhao=2;
}
i=table1[num];
write_date(0x30+i);
}
P2=0xf7;
if(P2!=0xf7){ delay(20);
if(P2!=0xf7){ temp=P2&0xf0;
switch(temp)
{
case 0xe0:num=12; break;
case 0xd0:num=13; break;
case 0xb0:num=14; break;
case 0x70:num=15; break;
}
} while(P2!=0xf7);
switch(num)
{
case 12:{write_com(0x01);a=0;b=0;flag=0;fuhao=0;}
break;
case 13:{
if(flag==0)
{ a=a*10; write_date(0x30); P2=0; }
else if(flag>=1)
{ b=b*10; write_date(0x30); }
} break;
case 14:{j=1;
if(fuhao==1)
{
write_com(0x80+0x4f);
write_com(0x04);
c=a+b;
while(c!=0){write_date(0x30+c%10); c=c/10; }
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==2)
{
write_com(0x80+0x4f);
write_com(0x04);
if(a-b>0) c=a-b;
else c=b-a;
while(c!=0) { write_date(0x30+c%10);c=c/10; }
if(a-b<0) write_date(0x2d);
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==3)
{write_com(0x80+0x4f); write_com(0x04);
c=a*b;
while(c!=0) {write_date(0x30+c%10); c=c/10; }
write_date(0x3d); a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==4)
{write_com(0x80+0x4f);
write_com(0x04);
i=0;
if(b!=0)
{
c=(long)(((float)a/b)*1000);
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
i++; if(i==3) write_date(0x2e);
}
if(a/b<=0)
{
if(i<=2)
{
if(i==1) write_date(0x30);
write_date(0x2e); // .
write_date(0x30);
}
write_date(0x30); //
}
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else
{
write_date('!');write_date('R');write_date('O');
write_date('R');write_date('R');write_date('E');
}
}
} break;
case 15:{write_date(0x30+table1[num]);flag=1;fuhao=1;} break;
}
}//P2!=0xf7
}
main()
{
init();
while(1)
{
keyscan();
}
}

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