gfortran - What are TRUE and FALSE constants (without the surrounding periods ('.')) in Fortran? -


consider below program

program   print*,.true.,.false.   print*,true,false end program

this program prints different values in pgfortan , gfortran.

pgfortran output

t f 0.00000000       0.00000000

gfortran output

t f 4.59135442e-41   5.87982594e-39

question - logical constants .true. , .false. displayed t , f. these constants true , false, there no . around constants?

as suggested albert, true , false have no intrinsic meaning in fortran - ordinary identifiers must declared , assigned value. application uses module bunch of vendor-supplied declarations , these might include declarations of true , false named constants, on windows platform.

in example, true , false implicitly declared, uninitialized variables. since uninitialized, value undefined. implementations might give uninitialized variables 0 value, not. it's better not default values zero, aware of programming errors earlier.

and while we're on topic of logical values, i'll point an old post of mine on subject.


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