7-seg

#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
unsigned char digit[] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x83, 0xF8, 0x80, 0x98};
int number;
void display_7seglend(unsigned char *led, unsigned int number){
	PORTA = ~led[number];
}
int main(void){
	DDRA = 0xFF; DDRC=0xff;
	number=2345;
	int ch =0;
	while (1)
	{
		int four = number % 10000 / 1000;
		int three = number % 1000 / 100;
		int two = number % 100 / 10;
		int one = number % 10;
		if((PIND &= 1<<PD6) && (ch == 0)){
			ch=1;
		}
		else if((PIND &= 1<<PD6) && (ch == 1)){
			number++;
			_delay_ms(10);
			ch=0;
		}
		if(PIND &= 1<<PD7){
			number--;
			_delay_ms(10);
		}
		int num[] = {four, three, two, one};
		for(int i=0; i<4; i++){
			PORTC = ~(1<<i);
			display_7seglend(digit, num[i]);
			_delay_ms(10);
		}
	}
	return 0;
}