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docs.arduino.cc › language-reference › en › variables › data-types › unsignedLong

unsigned long | Arduino Documentation

Unsigned long variables are extended size variables for number storage, and store 32 bits (4 bytes). Unlike standard longs unsigned longs won’t store negative numbers, making their range from 0 to 4,294,967,295 (2^32 - 1). ... The content on docs.arduino.cc is facilitated through a public ...

Stack Overflow

stackoverflow.com › questions › 31368089 › arduino-long-long-int-doc

Arduino long long int doc - Stack Overflow

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1 of 1

Typedefs such as int64_t are declared by AVR libc and aren't specific to the Arduino platform. There's a reference page on them here.

Arduino Getting Started

arduinogetstarted.com › reference › arduino-unsigned-long

unsigned long | Arduino Getting Started

June 5, 2026 - unsigned long time; void setup() { Serial.begin(9600); } void loop() { Serial.print("Time: "); time = millis(); //prints time since program started Serial.println(time); // wait a second so as not to send massive amounts of data delay(1000); }

Arduino Getting Started

arduinogetstarted.com › reference › arduino-long

long | Arduino Getting Started

June 5, 2026 - How to use long with Arduino. Learn long example code, reference, definition. Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647. What is Arduino long.

Stack Exchange

arduino.stackexchange.com › questions › 20660 › difference-between-data-type-int-and-long-on-arduino

programming - Difference between data type int and long on Arduino - Arduino Stack Exchange

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1 of 6

On the Arduino (AVR models) an int is 16 bits, not 32 bits. Thus it goes from -32768 to +32767.

That is different from long which is 32 bits.

2 of 6

According to the C language specification, int must be at least 16 bits or longer and long must be at least 32 bits or longer.

It is OK for a compiler to implement int as 32 bits or even 64 bits. It is OK for a compiler to implement long as 64 bits or longer. But it is not allowed for a compiler to implement long as 16 bits.

So when to use which type?

If the values you will be working with can be represented within 16 bits then it's OK to use int. If you need more than 16 bits use long. If you need more than 32 bits use long long.

Do not be caught up with compiler and/or CPU specifics. As mentioned by others, even within the same product range, Arduinos, there are 16 and 32 bit CPUs available. Instead, only trust what the standard guarantees.

The full specification of types in C are:

char must be at least 8 bits
int must be at least 16 bits
long must be at least 32 bits
long long must be at least 64 bits

Note: It is perfectly legal for compilers to implement char, int, long and long long as 64 bits. This is in fact not uncommon among DSPs.

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Arduino DUE & long variables - Programming - Arduino Forum

March 28, 2022 - In documentation it say that for Arithmetic Operations we can use int, float, double, byte, short and long Variables. Byte have 8 bites, int and short have 16 bits for Arduino UNO and 32 bits for Arduino DUE. Question …

Assiss

assiss.github.io › arduino-zhcn › cn › Reference › Long.html

Arduino - Long

Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647.

The Robotics Back-End

roboticsbackend.com › home › arduino variable types [complete guide]

Arduino Variable Types [Complete Guide] - The Robotics Back-End

September 28, 2021 - Again, the use you’ll make of long is pretty similar to int data type, just for larger numbers. On Arduino, when you try to get the time with millis or micros, you will get a result in unsigned long.

forum.arduino.cc › projects › general guidance

How big is a long? - General Guidance - Arduino Forum

May 31, 2021 - Confused! Simple code....receives a single number from the serial console and multiplies it by 10,000. receivedChar=Serial.read(); //The character is read. It's 0-9 Serial.println(receivedChar); // Check it's been received OK long asInteger=receivedChar -'0'; // Convert it to a number Serial.println(asInteger); //print the number out to check it's not changed long newInteger=10000*asInteger; //Multiply it by 10000 so it;s in the range 10000 to 90000 Serial.println(newIn...

Unsigned long proper calculation method - Programming - Arduino Forum

April 18, 2024 - I am trying to put the result of a calculation that uses an int and an uint8_t and for testing purposes lets include a float aswell. Do i need to convert every parameter of the calculation to and unsigned long using the (unsigned long) datatype prefix inside the calculation to have a proper and usable as unsigned long result? for example: int a = 3054; uint8_t b = 6; float c = 1.15; unsigned long Result = (a/b)*c; I'm pretty sure this is gonna do al sorts of wacky things so my question is h...

Altervista

ipsiagpstracker.altervista.org › arduino.cc › en › Reference › Long.html

Arduino - Long - GPS Tracker

Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647.

reddit.com › r/arduino › in this code , what is the function of the "long duration, distance; " line ?? [beginner]

r/arduino on Reddit: In this code , what is the function of the "long duration, distance; " line ?? [BEGINNER]

February 7, 2016 - Duration and distance are both variables, but until you specify what type of variable, they're meaningless to the compiler. A long variable is just a number (like an integer) that keeps extra space in the RAM to hold extra long numbers.

Stack Overflow

stackoverflow.com › questions › 47761194 › using-long-ints-with-arduino-uno

Using long ints with Arduino Uno - Stack Overflow

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1 of 1

I will make a guess and say, you forgot to change the type of the variable price.

It should be:

void fill_que(unsigned long b)
{
  unsigned long price = b;
  while(price > 0)
  {
    queue.push(price%10);
    Serial.print(price%10);
    price/=10;
  }
}

int main()
{
  unsigned long price1 = 36111;
  fill_que(price1);
}

How do I declare a (long) variable = 1234567 - Programming - Arduino Forum

May 17, 2015 - I have an 8 digit 7 segment display. I want to display numbers greater than 16 bits but can't. :frowning: I've tried starting at.... long i = 1234567; long i = 1234567L; long i = 1234567LL; but they all seem to resu…