Why Does Using `int waveHeader = 'EVAW';` Generate a Multi-Character Constant Warning?

Warning from Multi-Character Constant

Why is the following code generating a warning?

int waveHeader = 'EVAW';

Cause:

The warning stems from the C standard's (§6.4.4.4/10) ambiguity in interpreting multi-character constant values.

Multi-Character Constants:

Multi-character constants represent values spanning more than one character within an integer. For instance, using single quotes, one can store up to four ASCII characters in a 32-bit integer or eight in a 64-bit integer.

Portability Issues:

However, as the standard does not specify the order in which these characters are packed, using multi-character constants in portable code is problematic. This can lead to unpredictable behavior on different platforms or compilers.

Recommendation:

For portable code, it is recommended to avoid using multi-character constants with integer types. Instead, consider assigning meaningful numeric values to constants or utilizing const variables.

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