Failure to exactly match the return value with the function's declared data type can lead to undesired results because the return value is always converted to the data type declared in the function's header line.

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When a function in programming languages like C or C++ is declared with a specific return type, any value it returns is automatically converted to that type, which can lead to data loss or unexpected behavior if the conversion is not compatible with the original data.

Failure to Exactly Match the Return Value with the Function's