//Button plus or minus one
#include
#include
int duan[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F}; //Hexadecimal of the common cathode digital tube 0 to 9
sbit K1 = P1^0;
sbit K2 = P1^7;
char num = 0;
//Delay function with parameters
void delay(unsigned int i){
while(i--);
}
//Main function
void main(void)
{
while(1){
if(K1 == 0){
delay(5000); //key press delay
if(K1 == 0){
num++;
}
}
if(K2 == 0){
delay(5000);
if(K2 == 0){
num --;
}
}
//cycle
if(num > 99){
num = 0;
}
if(num < 0){
num = 99;
}
//Knowledge point: The unit digit of any two-digit number divided by 10 is the tens digit
P3=0x08; //unit display
P0 = ~duan[num%10]; //Only multiples of ten modulo 10 equal 0, so other non-multiples of ten equal themselves plus their units digit
delay(5000);
P3=0x04; //ten digit display
P0= ~duan[num/10%10]; //Any number in the MCU divided by 10 equals its tens digit
delay(6000);
}
}
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