byte segTR=6, buton1=4, buton2=3, pinler[]={10,12,9,11};//D-C-B-A;
byte segVeri[10][4]={{0,0,0,0},
{0,0,0,1},
{0,0,1,0},
{0,0,1,1},
{0,1,0,0},
{0,1,0,1},
{0,1,1,0},
{0,1,1,1},
{1,0,0,0},
{1,0,0,1}};
void setup() {
for(byte i=0 ; i<=3 ; i++)
pinMode(pinler[i], OUTPUT);
pinMode(segTR, OUTPUT);
pinMode(buton1, INPUT);
pinMode(buton2, INPUT);
}
void loop() 
{ 
 if(digitalRead(buton1)==0)  
 {  
  digitalWrite(segTR,0); 
  for(byte rakam=0;rakam<=9;rakam++)
   for(byte i=0; i<=3; i++)
    for(byte i=0; i<=3; i++) 
     digitalWrite (pinler[i],segVeri[rakam][i]);
     delay(500); }  
if(digitalRead(buton2)==0)  
 {  
  digitalWrite(segTR,0); 
  for(byte rakam=0;rakam<=0;rakam++)
   for(byte i=0; i<=3; i++)
    for(byte i=0; i<=3; i++) 
     digitalWrite (pinler[i],segVeri[rakam][i]);
     delay(500); } 
}