This rule is part of MISRA C++:2023.
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Rule 5.13.6 - An integer-literal of type long long shall not use a single L or l in any
suffix
[lex.icon]
Category: Required
Analysis: Decidable,Single Translation Unit
Amplification
This rule applies to both signed long long and unsigned long long literals.
Note: this rule does not apply to user-defined-literals.
Rationale
A literal with a suffix that has a single L could be a signed or unsigned long long. Use of the
LL suffix for long long literals is more explicit and less error-prone.
Example
All of the following examples assume that long is 32-bits and long long is 64-bits.
auto k1 = 12345678998L; // Non-compliant
auto k2 = 12345678998UL; // Non-compliant
auto k3 = 12345678998ull; // Compliant
auto k4 = 0xfeeddeadbeefL; // Non-compliant
auto k5 = 0xfeeddeadbeefLL; // Compliant
The rule does not apply to the following as the value is not long long:
auto k6 = 12345L;
auto k7 = 12345UL;
auto k8 = 0x0badc0deL;
The rule does not apply to the following as they do not have L or l suffixes:
auto k9 = 12345678998;
auto kA = 12345678998U;
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