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6.1.13 Implicitly convert LOGICAL and INTEGER values
As an extension for backwards compatibility with other compilers, GNU
Fortran allows the implicit conversion of LOGICAL values to
INTEGER values and vice versa. When converting from a
LOGICAL to an INTEGER, .FALSE. is interpreted as
zero, and .TRUE. is interpreted as one. When converting from
INTEGER to LOGICAL, the value zero is interpreted as
.FALSE. and any nonzero value is interpreted as .TRUE..
LOGICAL :: l
l = 1
INTEGER :: i
i = .TRUE.
However, there is no implicit conversion of INTEGER values in
if-statements, nor of LOGICAL or INTEGER values
in I/O operations.
