#include <reg51.H>

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char count=0;

unsigned char temp;

void delay1ms(void)
{
unsigned char k;     
for(k=0;k<121;k++);
}
void main(void)
{
while(1)
temp=count;
P0=table[count%10];P2=0xfe;
delay1ms();
P0=table[count/10];P2=0xfd;
delay1ms();

P3=0xff;
if(P3==0xfb)
{
count++;
if(count==100);
{
count=0;
}
}
}

 這段程序編譯沒有錯誤，只有2個警告

*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?PR?DELAY1MS?COUNT
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?CO?COUNT
 不懂是什么意思，也不能調試運行

改成這樣就好了 

#include <reg51.H>

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char count=0;

unsigned char temp;

void delay1ms(void)
{
unsigned char k;    
for(k=0;k<121;k++);
}
void main(void)
{
while(1)
{
P0=table[count%10];P2=0xfe;
delay1ms();
P0=table[count/10];P2=0xfd;
delay1ms();

P3=0xff;
if(P3==0xfb)
{
count++;
if(count==100);
{
count=0;
}
}
}
}
參考資料：http://sjcxlab.5d6d.com

你這個程序 循環 while(1)

后面必須要有個大括號 才能實現你要的目的

很感謝兩位老兄，程序可以調試了，也可以顯示。但還有個問題就是不能遞加，一直顯示兩個0