(INCOMPLETE)(MINIMAL INSTRUCTIONS) Add 0x24 and 0x56 and show it on LCD without using lcd.print() or lcd.write()

(INCOMPLETE)(MINIMAL INSTRUCTIONS) Add 0x24 and 0x56 and show it on LCD without using lcd.print() or lcd.write()

#include <Arduino.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);
void setup()
{
    lcd.begin(16,2);
    lcd.clear();
    lcd.setCursor(0,0);
    byte x1=0x24;
    byte x2=0x56;
    byte z=x1+x2;
    byte z1=z>>4;
    z1=z1&0x0F;
    byte z2= z>>0;
    z2=z2&0x0F;
    if (z1<=9)
    {
        z1=z1+0x30;
    }
    else
    {
        z1=z1+0x37;
    }
    if (z2<=9)
    {
        z2=z2+0x30;
    }
    else
    {
        z2=z2+0x37;
    }
Serial.begin(9600);
byte p=0;
/// configure LCDDR
    digitalWrite(A0,LOW);
    digitalWrite(A0,HIGH);
delay(5);
byte zz[]={z1,z2};
byte i,cc;
while(p<=1)
{ i=7; // for loop variable 
cc=1; 
    while(cc<=2)
   {
       for (byte pc=5;i>=i-3;i--,pc--) ///i-3 = 7-3 = 4 /// pc goes from 5 to 2
    {
        bitWrite(PORTC,pc,bitRead(zz[p],i));

    } // for loop ends
    digitalWrite(A1,LOW);
    digitalWrite(A1,HIGH);
    digitalWrite(A1,LOW);
    delay(5);
    cc=cc+1;
   } // second while ends
   p=p+1;
} // first while ends
pinMode(13,OUTPUT); // added this to check whether the program gets stuck at loops or not
}

void loop()
{
    digitalWrite(13,HIGH);
    delay(500);
    digitalWrite(13,LOW);
    delay(500);

}