This program has two input checks: one for a blank card to indicate end-of-data, and the other for a zero value within the input data. Either condition causes a message to be printed.
If one of the input values is zero, then the program will end with an error code of "1" in the job control card listing following the execution of the program. Normal output will be one line printed with A, B, C, and AREA. No specific units are stated.
The primary looping construct in Fortran is the iterative DO loop. Here's an example:
Fortran programmer should always write new code in Fortran 90 or Fortran 95, but for those of you stuck on a desert island with only a FORTRAN 77 compiler at your disposal, here's a way to write a recursive subroutine. FORTRAN 77 subroutines and functions are not allowed to call themselves directly. Attempting to do such will result in a compile...
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