4.11.1. The Arithmetic Conversions
The arithmetic conversions, which we introduced in § 2.1.2 (p. 35), convert one arithmetic type to another. The rules define a hierarchy of type conversions in which operands to an operator are converted to the widest type. For example, if one operand is of type long double, then the other operand is converted to type long double regardless of what the second type is. More generally, in expressions that mix floating-point and integral values, the integral value is converted to an appropriate floating-point type.
Integral Promotions
The integral promotions convert the small integral types to a larger integral ...
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