Serial input parallel output shift registers with arduino

Question

I need a way to rewrite the switch case part in a more efficient way.

int y , x ;
byte dataArray[6];
void setup () {
 pinMode(8,OUTPUT); 
 pinMode(11,OUTPUT);
 pinMode(12,OUTPUT);
 Serial.begin(9600);
 dataArray[0] = 0x3 ; //00000011
 dataArray[1] = 0x5 ; //00000101
 dataArray[2] = 0x9 ; //00001001
 dataArray[3] = 0x11; //00010001
 dataArray[4] = 0x21; //00100001
 dataArray[5] = 0x41; //01000001
}
void loop () {
 while (Serial.available()>0) {
 y = Serial.read();
 x = Serial.read();
 switch ( x ) {
 case 1:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW);
 break;
 case 2:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW); 
 break;
 case 3:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW); 
 break;
 case 4:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW); 
 break;
 case 5:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW); 
 break;
 case 6:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,dataArray[y]);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW); 
 break;
 default:
 digitalWrite(8,LOW);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 shiftOut(11,12,LSBFIRST,0);
 digitalWrite(8,HIGH);
 delay(10);
 digitalWrite(8,LOW);
 break;
 }
 }
 }

• Matt Young: This question appears to be off-topic because it is a programming question.
• Abdelrahman Tarief: @MattYoung you are right i didn't take this in mind sorry

Answer 1

unsigned char i;
digitalWrite(8,LOW);
for(i=0;i<=6;i++){
 if(x+i==6) shiftOut(11,12,LSBFIRST,dataArray[y]);
 else shiftOut(11,12,LSBFIRST,0);
 }
digitalWrite(8,HIGH);
delay(10);
digitalWrite(8,LOW);