The correct answer is C. frexp.

The frexp function decomposes a floating-point number x into a mantissa and a twos exponent. The mantissa is a floating-point number between 1 and 2, and the twos exponent is an integer between -128 and 127. The frexp function returns a pointer to the mantissa and a pointer to the twos exponent.

The trunc function rounds a floating-point number x down to the nearest integer. The fmod function returns the remainder of x divided by y. The ldexp function multiplies

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