Keyestudio ARDUINO maker learning kit, Manual

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Sample program
There are seven segments for numerical display, one for decimal point display. Corresponding
segments will be turned on when displaying certain numbers. For example, when displaying
number 1, b and c segments will be turned on. We compile a subprogram for each number, and
compile the main program to display one number every 2 seconds, cycling display number 0 ~ 9.
The displaying time for each number is subject to the delay time, the longer the delay time, the
longer the displaying time.
//////////////////////////////////////////////////////////
// set the IO pin for each segment
int a=7;// set digital pin 7 for segment a
int b=6;// set digital pin 6 for segment b
int c=5;// set digital pin 5 for segment c
int d=10;// set digital pin 10 for segment d
int e=11;// set digital pin 11 for segment e
int f=8;// set digital pin 8 for segment f
int g=9;// set digital pin 9 for segment g
int dp=4;// set digital pin 4 for segment dp
void digital_0(void) // display number 5
{
unsigned char j;
digitalWrite(a,HIGH);