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INTEGER, NATURAL and POSITIVE

Definition​

Integer, natural and positive are numbers that have a range between two numbers and can be assigned to numbers. Integer allows numbers from -2,147,483,647 to 2,147,483,647 Natural from 0 to 2,147,483,647 Positive from 1 to 2,147,483,647

Example​

SIGNAL counter : NATURAL range 0 to 255 := 0; 
counter <= counter + counter;