The two types of real-number constants are:

a. decimal, binary

b. encoded, binary

c. decimal, encoded

d. bcd, ascii

c. decimal, encoded

Explanation:

Decimal: in this type of real number constant, it consists of not more than 63 digits and either includes a decimal point or not within the range of binary integers e.g 37.5

Encoded: in this type of real number constant, it is used to put number, letter into a specialized format for efficient transmission or for storage e.g code used for text by most computers is (ASCII).

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