include<reg.51.h>
#define uchar  unsigned char
sbit LED=P1^0;
uchar n;
void main()
{
        n++;
        if(n=50)
        {n=0;
                LED=!LED;
        }
}


有2个worings  不知道错哪 求告知
下面是警告：
Build target 'Target 1'
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  ?C_START
    MODULE:  STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  ?C_START
    MODULE:  STARTUP.obj (?C_STARTUP)
    ADDRESS: 000DH
Program Size: data=9.0 xdata=0 code=15
"aa" - 0 Error(s), 2 Warning(s).


此帖出自小平头技术问答