Math Problem Statement

Consider the following floating-point number. The mantissa is written in binary, but the 2 and the exponent are in decimal.

0.0000011001100 * 20

If this value is converted to IEEE single precision floating point formate (i.e., a float on the common platform), what binary value will be stored in the exponent field? Remember that the value will be normalized before it is stored.

Solution

To solve this problem, let’s go through the steps required to convert this floating-point number to the IEEE 754 single-precision floating-point format.

Step 1: Normalize the Floating-Point Number

The given floating-point number is: 0.0000011001100×200.0000011001100 \times 2^0

In IEEE 754 format, the number needs to be normalized so that it has the form: 1.mantissa×2exponent1.\text{mantissa} \times 2^{\text{exponent}}

To normalize it, we need to shift the binary point in the mantissa until there's only one non-zero digit (1) to the left of the binary point.

The original binary mantissa is 0.00000110011000.0000011001100. Shifting the binary point 6 places to the right gives: 1.1001100×261.1001100 \times 2^{-6}

Thus, the normalized form of the number is: 1.1001100×261.1001100 \times 2^{-6}

Step 2: Calculate the Exponent in IEEE 754 Format

In IEEE 754 single-precision format, the exponent field is stored using a "bias" of 127. This means the exponent field represents: Exponent=actual exponent+127\text{Exponent} = \text{actual exponent} + 127

Here, the actual exponent is 6-6, so we calculate the biased exponent as: 6+127=121-6 + 127 = 121

Step 3: Convert the Exponent to Binary

The exponent 121121 in binary is: 12110=011110012121_{10} = 01111001_2

Answer

In IEEE 754 single-precision format, the binary value stored in the exponent field for this floating-point number is: 01111001\boxed{01111001}

Would you like further details on any part of the conversion process?


  1. What is the IEEE 754 format for a double-precision floating point?
  2. How do we handle subnormal numbers in IEEE 754?
  3. Why is there a bias in the exponent in IEEE floating-point format?
  4. How is the mantissa represented in IEEE single-precision format?
  5. What are the special values represented by IEEE 754, such as NaN and infinity?

Tip: Always remember that IEEE 754 uses a bias in the exponent field to allow both positive and negative exponents.

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Math Problem Analysis

Mathematical Concepts

Floating Point Representation
Binary Conversion
IEEE 754 Standard

Formulas

Normalized form: 1.mantissa * 2^exponent
Biased exponent: actual exponent + 127

Theorems

IEEE 754 Floating Point Standard

Suitable Grade Level

College level