INT number range?

Hardware
1

Several places in the documentation indicate that the range of a signed INT is +/-32768. The Spark Core has a 32 bit micro so this value should be +2,147,483,647. to -2,147,483,648
BTW I have not found the ranges for the Long or Float. But I will assume that they are the same as any other implementation of a 32 bit micro.

David G.

2

@sierrasmith71 If you want a 32-bit integer, you can use int32_t as your type.

3

No need for in32_t… int already has a signed range of +2,147,483,647. to -2,147,483,648. see code below, after about twenty seconds the variable “count” will overflow to -2,147,483,648

int count = 2147483638;

void setup()
{
pinMode(D7,OUTPUT);
Serial.begin (9600);
}

void loop()
{

digitalWrite(D7,HIGH);
delay(1000);
digitalWrite(D7,LOW);
delay(1000);
count++;

Serial.println(count);
}

David Garrison
4

Thanks @sierrasmith71—of course you are absolutely right. Where in the docs do we have it listed as 32768? Also, the docs are open source, so you can submit a pull request if you just fork the repo and fix it.

6

see: http://docs.spark.io/#/firmware/arithmetic-operators-additon-subtraction-division

David G.

1 Like
7

Thanks! Fixed.

Let us know if you see anything else incorrect.

1 Like