MCU interrupt application program

//==Declaration area= ...
#include
#define uint unsigned int
#define uchar unsigned char
void delay(uint a);
bit c,b;
//==Main program area= ...
void main()
{
 EA=1; //Open the general interrupt
 EX0=1; //Open external interrupt 0
 IT0=0; //Set interrupt 0 to level trigger
 IT1=0; //Set interrupt 0 to level trigger

 EX1=1; //Open external interrupt 1
 while(1)
 {
  P1=0xfe; //Turn off the LED in INT0
  P0=0xff; //Turn off the digital tube in INT1
  P0=0x00;
  P2=0xf8;
   P1=0xfe;
  while(1);
 }
}
//=Subroutine area==============================================================================================================================
void delay(uint a)
{
 uint b,c;
 for(b=a;b>0;b--)
  for(c=110;c>0;c--);
}
void Int0() interrupt 0 // The service subroutine of external interrupt 0 does not need to be declared in the declaration area
{
 uint a;
 a=10;
  while(a--) //You cannot use while(1) here. If not, when the external interrupt has become a high level, it is impossible to jump out of the interrupt service subroutine.
 {
  P0=0x00;
  P2=0xf8;
   P1=0xff;
  delay(1000);
  P1=0x00;
  delay(1000);
 }
}
void Int1() interrupt 2 //The service subroutine of external interrupt 1 does not need to be declared in the declaration area.
{
 delay(1);
 c=P3^3;
 if(c==0)
 {
  delay(1);
  if(c==0)
  {
   uint a;
   a=10;
   while((a--)) //You cannot use while(1) here. If not, when the external interrupt has become a high level, it is impossible to jump out of the interrupt service subroutine.
   {
   
    P1=0xff;
    P2=0xf8;
    P0=0x3f;
    delay(1000);
    P2=0xf9;
    P0=0x00;
    delay(1000);
    P2=0xf8;
    P0=0x06;
    delay(1000);
    P2=0xf8;
    P0=0x5b;
    delay(1000);
    P2=0xf8;
    P0=0x4f;
    delay(1000);
    P2=0xf8;
    P0=0x66;
    delay(1000);
    P2=0xf8;
    P0=0x6d;
    delay(1000);
    
   }
  }
 }


}

/*The program function is to light up the first LED. If the P3^2 port is at a low level, it will enter the interrupt program. The interrupt function is to flash all eight LEDs. If the P3^3 port is at a low level, it will enter external interrupt 1.
The program implementation of external interrupt 1 is that the first digital tube displays 0, 1, 2, 3, 4, 5. But I haven't figured out why there is a time interval between 0 and 1 and everyone's delay
They are the same, but the display is different.
The program implements that after the interrupt ends, the 8 LEDs of INT0 are still lit, and the last digital tube of INT1 is still lit, because the LED and digital tube are not turned off in the main program.
Note that my development board's P0 port is connected to a digital tube (common cathode), P2 port is 74HC138, and P1 port is LED*/