Because the identity and negation operators operate on a single operand, the type of the resulting value is the same as the type of the operand.
The following table indicates the resulting type when an arithmetic operator acts on a pair of operands.
Notation: T(param), where T is
the data type (I: integer, R: real, X: complex) and param is
the kind type parameter.
| first operand | second operand | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| I(1) | I(2) | I(4) | I(8) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) | |
| I(1) | I(1) | I(2) | I(4) | I(8) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) |
| I(2) | I(2) | I(2) | I(4) | I(8) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) |
| I(4) | I(4) | I(4) | I(4) | I(8) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) |
| I(8) | I(8) | I(8) | I(8) | I(8) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) |
| R(4) | R(4) | R(4) | R(4) | R(4) | R(4) | R(8) | R(16) | X(4) | X(8) | X(16) |
| R(8) | R(8) | R(8) | R(8) | R(8) | R(8) | R(8) | R(16) | X(8) | X(8) | X(16) |
| R(16) | R(16) | R(16) | R(16) | R(16) | R(16) | R(16) | R(16) | X(16) | X(16) | X(16) |
| X(4) | X(4) | X(4) | X(4) | X(4) | X(4) | X(8) | X(16) | X(4) | X(8) | X(16) |
| X(8) | X(8) | X(8) | X(8) | X(8) | X(8) | X(8) | X(16) | X(8) | X(8) | X(16) |
| X(16) | X(16) | X(16) | X(16) | X(16) | X(16) | X(16) | X(16) | X(16) | X(16) | X(16) |
Note: 
- XL Fortran implements
integer operations using INTEGER(4) arithmetic,
or INTEGER(8) arithmetic if data items are
8 bytes in length. If the intermediate result is used in a context
requiring INTEGER(1) or INTEGER(2) data
type, it is converted as required.
INTEGER(2) I2_1, I2_2, I2_RESULT INTEGER(4) I4 I2_1 = 32767 ! Maximum I(2) I2_2 = 32767 ! Maximum I(2) I4 = I2_1 + I2_2 PRINT *, "I4=", I4 ! Prints I4=-2 I2_RESULT = I2_1 + I2_2 ! Assignment to I(2) variable I4 = I2_RESULT ! and then assigned to an I(4) PRINT *, "I4=", I4 ! Prints I4=-2 END