单片机89c51，帮我编个C程序，顺便说一下用KeiluVision3仿真调试软件的调试步骤

#include sbit p20=P2^0; sbit p21=P2^1; sbit p22=P2^2; sbit p25=P2^5; sbit p26=P2^6; typedef unsigned char uint8; code uint8 num[]={0xc0,0xf9,0xa4,0xb0,0x99, 0x92,0x82,0xf8,0x80,0x90,}; uint8 count,shi,ge,i; delay() {