Connection to a microcontroller seven-segment display

#include <mega8.h> 
void main(void) 
{ 
PORTB=0x00; 
DDRB=0b00000001; //do the leg PB0 output 
 
PORTD is set=0b00000110; // print on the legs of PB1 and PB2 log unit to ignite the number 1 
DDRD=0b01111111; //Make legs PB0-PB6 outputs 
 
while (1) {} 
} 

#include <mega8.h> 
#include <delay.h> 
unsigned char numder[]= //define an array, where the index will correspond to the output digit 
{  
0b00111111, //0 
0b00000110, //number 1 
0b01011011, //number 2 
0b01001111, //number 3 
0b01100110, //number 4 
0b01101101, //number 5 
0b01111101, //figure 6 
0b00000111, //number 7 
0b01111111, //number 8 
0b01101111, //number 9 
}; 
 
void out(unsigned char num) 
{ 
PORTD is set=numder[num]; 
} 
 
void main(void) 
{ unsigned char i=0; 
PORTB=0x00; 
DDRB=0b00000001; //do the leg PB0 output 
 
PORTD is set=0b0000000; 
DDRD=0b01111111; //Make legs PB0-PB6 outputs 
 
while (1)  
{ 
out(i++); 
delay_ms(1000);//delay for 1 second 
} 
} 

#include <mega8.h> 
#include <delay.h> 
unsigned char numder[]= //define an array, where the index will correspond biti on port D 
{  
0b00111111, //0 
0b00000110, //number 1 
0b01011011, //number 2 
0b01001111, //number 3 
0b01100110, //number 4 
0b01101101, //number 5 
0b01111101, //figure 6 
0b00000111, //figure 7 
0b01111111, //number 8 
0b01101111, //number 9 
}; 
 
void out(unsigned char num) 
{  
PORTD is set=numder[num]; 
} 
 
void main(void) 
{ unsigned char z=0; 
PORTB=0x00; 
DDRB=0b00000011; //do the leg PB0 and PB1 output 
 
PORTD is set=0b0000000; 
DDRD=0b01111111; //Make legs PB0-PB6 outputs  
while (1)  
{ 
if (z==0) //if z=0, we deduce the first digit of the 
{ 
out(1); //print 1 
PORTB=0b00000001; // switch семисегментник that hangs cathode on the leg PB0 
} 
if (z==1) //if z=1, we derive the second figure 
{ 
out(7); // display the digit 7 
PORTB=0b00000010; // Switch семисегментник on the leg PB1 
}  
if (++z>1) z=0; // increase the z on the unit and check to see if it 1. If not, the z record 0 
delay_ms(40); //Make the delay in 40 milliseconds, this 25 of the conclusions of the second 
} 
} 

#include <mega8.h> 
#include <delay.h> 
unsigned char chislo[2]; //define an array of two elements of type char unsigned(unsigned) 
unsigned char numder[]= //define an array, where the index will correspond biti on port D 
{  
0b00111111, //0 
0b00000110, //number 1 
0b01011011, //number 2 
0b01001111, //number 3 
0b01100110, //number 4 
0b01101101, //number 5 
0b01111101, //figure 6 
0b00000111, //number 7 
0b01111111, //number 8 
0b01101111, //number 9 
}; 
unsigned char i=0; // variable to determine what rank семисегментника output the number of 
// interrupts overflow timer0 
interrupt [TIM0_OVF] void timer0_ovf_isr(void) 
{ 
PORTD is set=numder[ chislo[i] ];  
PORTB=i+1; //switch a certain category of семисегментника 
if (++i>1) i=0; 
} 
 
void out(unsigned char num) 
{  
/*first we need to determine how many tens and units is displayed number. 
For example, we passed "45", we need to lay it out on the 4 and 5 to the first decimal семисегментника  
display figure 4, and the other 5 */ 
chislo[0]=num%10; //the % operator gives the remainder of integer division, for example, 34%10 will be 4 
chislo[1]=num/10; // find out how many tens in the number of 
} 
 
void main(void) 
{ 
unsigned char z=0; // variable that will be displayed 
PORTB=0x00; 
DDRB=0b00000011; //do the leg PB0 and PB1 output 
 
PORTD is set=0b0000000; 
DDRD=0b01111111; //Make legs PB0-PB6 outputs  
 
TCCR0=0x03; //set the timer prescaler 
TCNT0=0x64; // number which the timer begins to count up to 255 
 
TIMSK=0x01; // overflow interrupt timer 0 
#asm("sei") //allow interrupts 
 
while (1)  
{ 
out(z++); // print the value of variable z and increase it by 1 
delay_ms(1000); //Make the delay in 40 milliseconds, this 25 of the conclusions of the second 
} 
}