Hiển thị số lần nhấn nút lên led 7 thanh dùng ngắt

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#include <REGX52.H>
#include<stdio.h>
sbit led1= P1^0;
sbit led2= P1^1;

unsigned char m[10]= {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
int num,i,l1,l2;
void delay(int time)
{
while(time--);
}
void sang(void)
{

int k;
l1=num/10;
l2=num%10;
for(k=0;k<100;k++)
{
P2=m[l1];
led1=1;led2=0;
delay(100);

P2=0xff;
delay(100);

P2=m[l2];
led2=1; led1=0;
delay(100);

P2=0xff;
delay(100);
}
}
void ngat(void) interrupt 0
{
num++;
}
void main()
{

EA=1;
IT0=1;
IE=0x81;
while(1)
{
sang();

}
}