//= = declared area = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

# include & ltreg 5 1 . h & gt； //defines the header file of 805 1 register, P2- 17~ 19.

#define SEG P0 // Define seven-segment LED digital tube connected to port 0.

/* Declare seven-segment LED digital tube driving signal array (* * * Yang) */

Charcode tab [10] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99,//Numbers 0-4.

0x92，0x83，0xf8，0x80，0x 98 }； //Numbers 5-9

Invalid delay (int); //Declare the delay function

//= = Main program = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

Main() // main program starts.

{unsigned character i; //Declare the unsigned variable i.

While (1) // loops indefinitely, and the program keeps running.

for(I = 0； I< 10; I++) // displays 0-9, *** 10 times.

{ SEG = TAB[I]； //Display numbers

Delay (500); //Delay 500× 1m=0.5 seconds

}//End of the for loop

}//End of main program

//= = Subroutine = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

/* delay function, the delay is about x× 1ms */

Void delay (int x) // Delay function start

{ int i，j； //declare integer variables I, J.

for(I = 0； I & ltx；; I++) // Count x times with a delay of x ×1ms.

for(j = 0； j & lt 160; j++)； //Count 120 times, delay1ms.

}//End of delay function