用C语言给单片机编程时,主函数中的变量为什么都得定义成全局变量答:变量是定义成全局变量还是局部变量得看变量的在程序中所起的作用,比如如下程序:include <REGX52.h> unsigned int int_count=0;unsigned char count=0;unsigned char second=0;unsigned char seg[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x40};unsigned char seg1[]={0x...