How to Determine IEEE 754 Compliance in C ?

Checking IEEE 754 Compliance in C

Unlike in C, where a specific macro can be used to determine if the compiler adheres to the IEEE 754 floating-point standard, C provides a more straightforward approach.

According to the C standard (18.2.1.1), the std::numeric_limits class contains a static member is_iec559. This member indicates whether IEEE 754 is supported for the specified floating-point type.

To check if your compiler utilizes IEEE 754, you can use the following code:

<code class="cpp">std::cout << std::boolalpha;
std::cout << "Double: " << std::numeric_limits<double>::is_iec559 << std::endl;
std::cout << "Float: " << std::numeric_limits<float>::is_iec559 << std::endl;</code>

The output of this code will be true if IEEE 754 is in use for the respective floating-point types and false otherwise.

Alternatively, you can utilize the method suggested by Adam's answer for C . However, it should be noted that different compilers may have specific mechanisms for checking IEEE 754 compliance. Consulting your compiler's documentation is recommended for additional insights.

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