Running seconds program-digital tube display

/*
Program effect: running seconds, displaying four digital tubes at the same time
Copyright: http://www.51hei.com Please keep it when reprinting.
P1 controls the bit of the digital tube, P2 controls the segment
Note: If you cannot compile in Keil, please delete all leading blanks in each line,
*/
#include //Header file
#define uchar unsigned char //Macro definition
#define uint unsigned int
void display(); //Function declaration
uchar code table[]={0x3f,0x06,0x5b,//Number displayed by the digital tube
0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
void delay(uchar x) //Delay function, I can't calculate the time
{
uchar i,j;
for(i=x;i>0;i--)
for(j=110;j>0;j--);
}
void main() //Main function
{
while(1)
{
display(); //Display subfunction
}
}
void display()
{
uchar i,j,k,l; //Define local variables
P1=0xff; //Light up the rightmost digital tube
P2=table[i]; //Send value, display each digit
delay(10); //Delay
i++; //Increase by one, as a reference for the next display
if(i==10)
{
i=0; //When i value reaches 10, clear
j++;
P1=0xfe; //Light up the next digital tube
P2=table[j];
delay(10);
}
if(j==10)
{
j=0;
k++;
P1=0xfd;
P2=table[k];
delay(10);
}
if(k==10)
{
k=0;
l++;
P1=0xfc;
P2=table[l];
delay(10);
if(l==10)
l=0;
}
//The following statement is indispensable
P1=0xfe; //Display tens digit
P2=table[j];
delay(10);

P1=0xfd; //display hundreds digit
P2=table[k];
delay(10);

P1=0xfc; //display thousands digit
P2=table[l];
delay(10);
}
Note: If you cannot compile in Keil, please delete all leading spaces in each line.