15.2. Variables as Values
If an expression denotes a variable, and a value is required for use in further evaluation, then the value of that variable is used. In this context, if the expression denotes a variable or a value, we may speak simply of the value of the expression.
If the value of a variable of type float or double is used in this manner, then value set conversion (§5.1.13) is applied to the value of the variable.
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