AVR Freaks

hello freaks,

I just got into Timer/counter programming, and i'm trying to make a counter circuit using atmega16 and 7-segment.

but i reached to a point where the counting on 7-segment displays doesn't go well.

Here is the code I used and the circuit is attached too:

#define  F_CPU 1000000ul
#include <avr/io.h>
#include <util/delay.h>
#define SegOne   0x01
#define SegTwo   0x02
#define SegThree 0x04	
int main(void)
{
	TCCR0 |= (1<<CS02) | (1<<CS01);
	TCCR0 &= ~(1<<CS00);
	DDRC = 0xff; // Data lines
	DDRD = 0xff; // Control signal PORTD0-PORTD3
	int num,temp;
	char seg_code[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
    while (1) 
    {
		num = TCNT0;
		temp = num / 100;
		num = num % 100;
		PORTD = SegOne;
		PORTC = seg_code[temp];
		_delay_ms(1);

		temp = num / 10;
		num = num % 10;
		PORTD = SegTwo;
		PORTC = seg_code[temp];
		_delay_ms(1);

		temp = num / 1;
		PORTD = SegThree;
		PORTC = seg_code[temp];
		_delay_ms(1);
    }
}

Can anyone please tell me where is my mistakes?