int clockpin = 2; // connect ke pin 11 on the '595
int latchpin = 3; // connect ke pin 12 on the '595
int datapin = 4; // connect ke pin 14 on the '595
float b = 0;
int c = 0;
float d = 0;
int e = 0;
int speed = 500; 
int segdisp1[10] = {3,159,37,13,153,73,65,27,1,9 };

int segdisp[10] = {
  0b00111111,
  0b00000110,
  0b01011011,
  0b01001111,
  0b01100110, 
  0b01101101, 
  0b01111101, 
  0b00100111, 
  0b01111111,
  0b01101111,  
};

void setup()
{
 pinMode(latchpin, OUTPUT);
 pinMode(clockpin, OUTPUT);
 pinMode(datapin, OUTPUT);
}
void loop()
{
 //  Count up
 for (int z=0; z<100; z++)
 {
   digitalWrite(latchpin, LOW);
   shiftOut(datapin, clockpin, MSBFIRST, 0); // clears the right display
   shiftOut(datapin, clockpin, MSBFIRST, 0); // clears the left display
   digitalWrite(latchpin, HIGH);
   if (z<10)
   {
     digitalWrite(latchpin, LOW);
     shiftOut(datapin, clockpin, MSBFIRST, segdisp[z]); 
     shiftOut(datapin, clockpin, MSBFIRST, 0); 
     digitalWrite(latchpin, HIGH);
   }
   else if (z>=10)
   {
     d=z%10; 
     c=int(d); 
     b=z/10; 
     e = int(b); 
     digitalWrite(latchpin, LOW); 
     shiftOut(datapin, clockpin, MSBFIRST, segdisp[c]); 
     shiftOut(datapin, clockpin, MSBFIRST, segdisp[e]); 
     digitalWrite(latchpin, HIGH);
   }
   delay(speed);
 }
 delay(2000);
 //  Count down
 for (int z=99; z>=0; z--)
 {
   digitalWrite(latchpin, LOW);
   shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the right display
   shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the left display
   digitalWrite(latchpin, HIGH);
   if (z<10)
   {
     digitalWrite(latchpin, LOW);
     shiftOut(datapin, clockpin, LSBFIRST, segdisp[z]); 
     shiftOut(datapin, clockpin, LSBFIRST, 255); 
     digitalWrite(latchpin, HIGH);
   }
   else if (z>=10)
   {
     d=z%10; 
     c=int(d); 
     b=z/10; 
     e = int(b); 
     digitalWrite(latchpin, LOW); 
     shiftOut(datapin, clockpin, LSBFIRST, segdisp[c]); 
     shiftOut(datapin, clockpin, LSBFIRST, segdisp[e]); 
     digitalWrite(latchpin, HIGH);
   }
   delay(speed);
 }
 
   delay(2000);
}