fegetround - Linux

Overview

fegetround retrieves the current rounding mode for floating-point operations in the floating-point environment. It is a useful tool for debugging floating-point code and ensuring consistent rounding behavior across different systems or platforms.

Syntax

fegetround() -> rounding mode integer

Options/Flags

None

Examples

Example 1: Get the Current Rounding Mode

rounding_mode = fegetround()
print(rounding_mode)

Example 2: Check if Rounding is Toward Positive Infinity

if fegetround() == FE_UPWARD:
    print("Rounding is toward positive infinity")

Common Issues

• The rounding mode can be set by calling fesetround(), but it is typically reset to the default value (FE_TONEAREST) when the program terminates, ensuring predictable rounding behavior.

Integration

• fegetround can be used in conjunction with fesetround to control rounding modes for specific floating-point operations, allowing precise control over the rounding behavior of complex calculations.
• It can be integrated into debugging scripts to check the rounding modes of floating-point variables or expressions, helping identify potential sources of rounding errors.

Related Commands

• fesetround – set the floating-point rounding mode
• fetestexcept – test for floating-point exceptions
• fenv – manage the floating-point environment configuration