int ns=0; //decimal
int op=0; //0-conv 1-add 2
String inp1;
int inp2=0;


void setup() {
  Serial.begin(9600);
  Serial.println("hi");

}

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

void modes(){
  if (ns==0){
    Serial.println("dec");
    if (op==0){
      int inp=getinp();
      Serial.println(inp);
      String res=hextodec(inp); 
      Serial.println(res);
    }
  }
}

int getinp(){
  Serial.println("Enter string:");
      while (Serial.available() == 0) {
      }

      String inpstr = Serial.readString();
      int inp = inpstr.toInt();
      return inp;
        
}



String dectohex(int inp) {
  char hex[4];  
  sprintf(hex, "%X", inp);
  return String(hex);
}

String hextodec(String inp) {
  char dec[4];  
  sprintf(dec, "%d", inp);
  return String(dec);
}