fortran - 涉及整数和实数操作数的算术

Question

在 Fortran 中，涉及整数和实数操作数的算术总是通过将整数操作数转换为实数来执行和真正的操作数一样吗？还是有什么异常(exception)？

Answer 1

这是在 Ch 中定义的。 Fortran 2008 Standard的7.1.5.1 “内部操作分类” :

注释 7.15 摘录:

Intrinsic operator      Type of     Type of       Type of
op                        x1          x2        [x1] op x2
----------------------------------------------------------
                           I        I, R, Z       I, R, Z
Binary +, –, *, /, **      R        I, R, Z       R, R, Z
                           Z        I, R, Z       Z, Z, Z

[...]

Note: The symbols I, R, Z, C, and L stand for the types integer, real, complex, character, and logical, respectively. Where more than one type for x 2 is given, the type of the result of the operation is given in the same relative position in the next column.

所以是的，在您的情况下它被转换为 real。