一本很好的介绍fortran的资料，Cap 1 - Getting Going: 5 Cap 2 - Chapter 2 Elementary Fortran: I: 8 Cap 3 - Chapter 3 Elementary Fortran: II: 24 Cap 4 - Chapter 4 Program Preparation: 41 Cap 5 - Chapter 5 Decisions: 47 Cap 6 - Chapter 6 Loops: 58 Cap 7 - Chapter 7 Errors: 80 Cap 8 - Chapter 8 Subprograms and Modu