2.6.2 Usual Arithmetic Conversions

Some binary operators convert the types of their operands to yield a common type, which is also the type of the result. These are called the usual arithmetic conversions:

• If either operand is type long double, the other operand is converted to long double.

• Otherwise, if either operand has type double, the other operand is converted to double.

• Otherwise, if either operand has type float, the other operand is converted to float.

• Otherwise, the integral promotions are performed on both operands. Then, these rules are applied:

  • If either operand has type unsigned long long int, the other operator is converted to unsigned long long int.

  • If either operand has type long long int, the other operator is converted to long long int.

  • If either operand has type unsigned long int, the other operand is converted to unsigned long int.

  • Otherwise, when you compile on SPARC V9 only and specify cc -xc99=none, if one operand has type long int and the other has type unsigned int, both operands are converted to unsigned long int.

  • Otherwise, if either operand has type long int, the other operand is converted to long int.

  • Otherwise, if either operand has type unsigned int, the other operand is converted to unsigned int.

  • Otherwise, both operands have type int.