Extend String to print 64-bit integers

Open
#156 1 comment 1 reaction 0 assignees View on GitHub

@asumo-1xts is already working on this.

Since Aug 30, 2026.

  • #277 by @asumo-1xts — open

Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
25/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
api, embedded-iot

Research direction

An open pull request (#277) already addresses this issue, so review it first. Start from the String overloads used through Arduino.h and compare the existing long-integer behavior with the missing 64-bit cases; the minimal example is done when String(1LL) compiles without an ambiguous-overload error.

Written by the indexing model from the issue text.

Description

String(long long int) and String(unsigned long long int) are not defined for relevant platforms, so String() is unable to parse 64-bit integers. A minimal non-working example would be:

#include <Arduino.h>

void setup() {
  String(1LL); // String(1L) compiles
}

void loop() {
}

Which produces an error call of overloaded 'String(long long int)' is ambiguous.

Dominant language
C++
Stars
306
Forks
150
No merged PRs in 30d

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  4. Open a pull request that references the issue number.

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