MISRA.TOKEN.L.SUFFIX.FLOAT

Usage of lowercase character "l" suffix in floating constant.

MISRA C 2012 Rule 7.3: The lowercase character “l” shall not be used in a literal suffix

Category: Required

Analysis: Decidable, Single Translation Unit

Applies to: C90, C99

Rationale

Using the uppercase suffix “L” removes the potential ambiguity between “1” (digit 1) and “l” (letter “el”) when declaring literals.

Example

Note: the examples containing the long long suffix are applicable only to C99.

const int64_t     a = 0L; 
const int64_t     b = 0l;      /* Non-compliant */ 
const uint64_t    c = 0Lu;
const uint64_t    d = 0lU;     /* Non-compliant */ 
const uint64_t    e = 0ULL;    
const uint64_t    f = 0Ull;    /* Non-compliant */ 
const int128_t    g = 0LL; 
const int128_t    h = 0ll;     /* Non-compliant */ 
const float128_t  m = 1.2L; 
const float128_t  n = 2.4l;    /* Non-compliant */