$ cat myfile.f90
program hello
print *, "Hello World!"
end program hello
Result:
$ gfortran myfile.f90 -o myfile
$ ./myfile
Hello World!
Syntax error because of the file extension
Command:
$ cat myfile.f
Result:
program hello
print *, "Hello World!"
end program hello
Command:
$ gfortran myfile.f -o myfile
Result:
myfile.f:1:1:
program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:1:1:
program hello
1
Error: Unclassifiable statement at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Non-numeric character in statement label at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Unclassifiable statement at (1)
myfile.f:3:1:
end program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:3:1:
end program hello
1
Error: Unclassifiable statement at (1)