Ada Reference Manual (Ada 2022) — Legal Information

# 2.4.1 Decimal Literals

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A decimal_literal is a numeric_literal in the conventional decimal notation (that is, the base is ten).

#### Syntax

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decimal_literal ::= numeral [.numeral] [exponent]
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numeral ::= digit {[underline] digit}
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exponent ::= E [+] numeral | E – numeral
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digit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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An exponent for an integer literal shall not have a minus sign.

#### Static Semantics

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An underline character in a numeric_literal does not affect its meaning. The letter E of an exponent can be written either in lower case or in upper case, with the same meaning.
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An exponent indicates the power of ten by which the value of the decimal_literal without the exponent is to be multiplied to obtain the value of the decimal_literal with the exponent.

#### Examples

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Examples of decimal literals:
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12 0 1E6 123_456 -- integer literals
12.0 0.0 0.456 3.14159_26 -- real literals

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