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A.2.5.3 Floating Constants
A floating constant consists of an integer part, a decimal part, a fraction part, an e or E, an optionally signed integer exponent and an optional type suffix, one of f, F, l, or L. The integer and fraction parts both consist of a sequence of digits. Either the integer part, or the fraction part (not both) may be missing; either the decimal point or the e and the exponent (not both) may be missing. The type is determined by the suffix; F or f makes it float, L or l makes it long double, otherwise it is double.