void setup() {
  // put your setup code here, to run once:
  volatile char *dirf,*dirk,x;
  volatile char *outf,*ink;
  dirf = 0x30; dirk = 0x107;
  outf = 0x31; ink = 0x106;
  *dirf = 0x01; *dirk = 0x00;
  while(1){
    x = *ink;
    if((x & 0x01) == 0x01){
      *outf = 0x01;
    }
    else{
      *outf = 0x00;
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}


/*      
 
 code with typecasting...........................


void setup() {
  // put your setup code here, to run once:
  volatile char *dirf, *dirk, *outf, *ink;
  volatile char x;

  // Assigning addresses to the pointers
  dirf = (volatile char *)0x30;
  dirk = (volatile char *)0x107;
  outf = (volatile char *)0x31;
  ink = (volatile char *)0x106;

  // Setting direction registers
  *dirf = 0x01;  // Set dirf to output
  *dirk = 0x00;  // Set dirk to input

  while(1) {
    x = *ink;  // Read input
    if((x & 0x01) == 0x01) {  // Check if the first bit is set
      *outf = 0x01;  // Set output
    } else {
      *outf = 0x00;  // Clear output
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:
} */