Which function is used to convert a number into a decimal number?

• A. int()
• B. float()
• C. str()
• D. number()

Answer: (B)

The function that is used to convert a number into a decimal number is the float() function. This function takes a number as an argument and returns its floating-point representation, which is a way to represent real numbers in Python that allows for fractions and decimal points.

For example, if you pass an integer like 5 to the float() function, it will return 5.0, indicating that it is now a decimal number. This is particularly useful when you need to perform calculations involving real numbers or when dealing with values that require precision, such as currency or measurements.

The other functions serve different purposes. The int() function converts a given value to an integer, stripping off any decimal part. The str() function converts a value to its string representation, and there's no built-in function named number() in Python for type conversion. Thus, float() is the appropriate choice for converting numbers into decimal format.