How to set a binary int?

Question

I am new to coding in C using a Arduino Uno. I would like to do the following:

int randomNumber;
int randomNumberBinairy = 0;

void setup() {
 Serial.begin(9600);
 randomSeed(analogRead(A0));
}

void loop() {
  randomNumber = random(1, 16);
  randomNumberBinairy = ((randomNumber, BIN));
  Serial.println(randomNumberBinairy);
  delay(5000);
}

This prints out:

2
2
2
2
etc..

However I would like it to print out the random number (between 1 and 16) in binary. So it should look something like:

101
1100
110
10
etc..

Any help on this please?

Arduino is not C! And all data is binary in a **binary** digital computer. — too honest for this site, Nov 20 '16 at 23:03

score 1 · Accepted Answer · answered Nov 20 '16 at 22:40

1

in arduino you can use the function bitRead(x, n)

int randomNumber;

void setup() {
 Serial.begin(9600);
 randomSeed(analogRead(A0));
}

void loop() {
  randomNumber = random(1, 16);
  Serial.print(bitRead(randomNumber, 0));
  Serial.print(bitRead(randomNumber, 1));
  Serial.print(bitRead(randomNumber, 2));
  Serial.println(bitRead(randomNumber, 3));
  delay(5000);
}

answered Nov 20 '16 at 22:40

a.costa

1,029
1
9
19

I think this is unnecessarily convoluted, **Serial.print** already provides an optional argument *format* which allows you to choose the format of the printed number. – Patrick Trentin Nov 22 '16 at 08:49

t.m. · Answer 2 · 2019-09-20T06:51:25.420

0

If you are sure it will be always 0 to 15 you can write a switch-case block that handles 16 different probability. That works faster than bitread(x, n) for each bit.

edited Sep 20 '19 at 06:51

answered Nov 20 '16 at 22:43

t.m.

1,430
16
29

score 0 · Answer 3 · edited Jun 20 '20 at 09:12

0

Just for your own reference, the documentation of Serial.print says:

Serial.print(78, BIN) gives "1001110"

Serial.print(78, OCT) gives "116"

Serial.print(78, DEC) gives "78"

Serial.print(78, HEX) gives "4E"

That is, if you want to print something in binary then you only need to write

Serial.print(randomNumber, BIN);
or
Serial.println(randomNumber, BIN);

It's simple as that.

edited Jun 20 '20 at 09:12

Community

1
1

answered Nov 22 '16 at 08:46

Patrick Trentin

7,126
3
23
40

How to set a binary int?

3 Answers3