To learn Fortran 77 correctly, you need a resource that is rigorous, mathematical, and full of drills. That resource is the Schaum's Outline.
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Before diving into the outline itself, one must understand the subject. Fortran 77 (officially known as Fortran 77, ANSI X3.9-1978) was the first standardized, machine-independent version of the language. To learn Fortran 77 correctly, you need a
"Schaum's Outline of Programming with Fortran 77" is a study guide and reference book that provides a comprehensive introduction to programming with Fortran 77. The book is designed for students, programmers, and engineers who want to learn Fortran 77 programming. To learn Fortran 77 correctly