Implicitly convert LOGICAL and INTEGER values - The GNU Fortran Compiler
Description: The GNU Fortran Compiler

Next: Hollerith constants support, Previous: Unary operators, Up: Extensions implemented in GNU Fortran

#### 6.1.12 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.