A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. If it does not contain a fractional part then the decimal representation does not require a decimal point.
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0.667 is a terminating decimal.
If it is unsigned representation (meaning high bit is not sign bit) then it is 7F which has a decimal equivalent of 127. If it is a signed number (meaning high bit is sign bit) then numbers range from decimal -64 to +63
The decimal numeral system (also called base ten or occasionally denary) has ten as its base. Decimal notation often refers to a base-10 positional notation.
A decimal number is not an integer. An integer is a number that is not a fraction, and decimal numbers are decimal fractions.
1.30 is a decimal number