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As a GNU extension for backwards compatability with other compilers,
`gfortran` allows the implicit conversion of LOGICALs to INTEGERs
and vice versa. When converting from a LOGICAL to an INTEGER, the numeric
value of `.FALSE.`

is zero, and that of `.TRUE.`

is one. When
converting from INTEGER to LOGICAL, the value zero is interpreted as
`.FALSE.`

and any non-zero value is interpreted as `.TRUE.`

.

INTEGER*4 i i = .FALSE.