Determining Compiler's Use of IEEE 754 Standard in C

Unlike C, which requires a specific define check to verify if the compiler adheres to the IEEE 754 standard, C offers a more straightforward approach. The C standard includes the numeric_limits class within the std namespace. To determine if the compiler employs IEEE 754, simply access the static member is_iec559 as follows:

std::numeric_limits::is_iec559;

or:

std::numeric_limits::is_iec559;

This expression returns true if IEEE 754 is in use, and false otherwise.

Alternatively, as suggested by Adam's answer, you can also employ another method:

#include 
#include 

int main() {
    double d = -0.0;
    std::cout 
If the compiler supports IEEE 754, this code outputs 0; otherwise, it outputs 1.