单片机：一位数码管显示

#include<reg51.h>
void main( )
{
    unsigned char x=1,y=2;
    unsigned char seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
    while(1)
    {
      P0=seg[x];
        P2=seg[y];
}
}