SIZEOF— Size in bytes of an expression
SIZEOF(X)calculates the number of bytes of storage the expression
N = SIZEOF(X)
|X||The argument shall be of any type, rank or shape.
POINTERattribute, the number of bytes of the storage area pointed to is returned. If the argument is of a derived type with
ALLOCATABLEcomponents, the return value does not account for the sizes of the data pointed to by these components. If the argument is polymorphic, the size according to the dynamic type is returned. The argument may not be a procedure or procedure pointer. Note that the code assumes for arrays that those are contiguous; for contiguous arrays, it returns the storage or an array element multiplied by the size of the array.
integer :: i real :: r, s(5) print *, (sizeof(s)/sizeof(r) == 5) end
The example will print
.TRUE. unless you are using a platform
REAL variables are unusually padded.