Ada Programming/Attributes/'Truncation

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Description

X'Truncation(Y) is an Ada attribute where X is any floating-point type and Y is any instance of that type. This attribute represents the truncation of Y to an integer value.

If Y is negative, then Truncation is equivalent to X'Ceiling(Y). If Y is positive, then Truncation is equivalent to X'Floor(Y).

Example

X : Float :=  1.5;
Y : Float :=  1.0;
Z : Float := -1.999;
 
pragma Assert (Float'Truncation(X) =  1.0);  -- Ok
pragma Assert (Float'Truncation(Y) =  1.0);  -- Ok
pragma Assert (Float'Truncation(Z) = -1.0);  -- Ok
pragma Assert (Float'Truncation(Z) = -2.0);  -- Wrong

See also

Wikibook

• Ada Programming
• Ada Programming/Attributes
• Ada Programming/Attributes/'Ceiling
• Ada Programming/Attributes/'Floor
• Ada Programming/Attributes/'Rounding
• Ada Programming/Attributes/'Unbiased_Rounding

Ada Reference Manual

• 13.3 Operational and Representation Attributes (Annotated)
• Annex K Language-Defined Attributes (Annotated)