MISRA C++:2023 Rule 5.13.5

The lowercase form of L shall not be used as the first character in a literal suffix

Since R2024b

Description

Rule Definition

The lowercase form of L shall not be used as the first character in a literal suffix.

Rationale

The lowercase character "l" (letter "el") can be confused with the digit 1. Use the uppercase "L" instead.

Polyspace Implementation

The rule checker reports a violation if you use the lowercase character "l" in a literal suffix.

Violations of this rule are not reported on unused macros.

Troubleshooting

If you expect a rule violation but Polyspace^® does not report it, see Diagnose Why Coding Standard Violations Do Not Appear as Expected.

Examples

Lowercase "l" Used in Literal Suffix

In this example, the rule checkers flags the literals that have a lowercase "l" in their suffix.

#define PI 3.14159l        // Compliant- Not flagged because
                           // the macro is unused
#define EULERNUM 2.71828l  //  Noncompliant- Flagged because
                           // macro is used
void func(long);
void foo(void){
	long a = 10l;   // Noncompliant
	long b = 10L;   // Compliant
	long c = 10lL;  // Noncompliant
	func(EULERNUM);
}

Check Information

Group: Lexical Conventions

Category: Required

Version History

Introduced in R2024b