And yet if you ask a modern programmer what a binary heap is or how Dijkstra’s algorithm works they just look at you with a blank stare.
I’m so old I dealt with this: A SOC7 abend, or data exception, usually indicates an issue with numeric data, particularly in COBOL or other mainframe programming contexts. It occurs when a field intended for numeric values contains non-numeric data or is used in a calculation before being initialized. Common causes include uninitialized indexes, incorrect field overlaps in packed decimal arithmetic, or using a packed decimal field that doesn’t contain a valid value.
I worked for Pacific Telephone/PacBell from 1980 through 1991. One of the perks was UNIX systems with full source code. A magnificent way to learn by example. I was already an avid C programmer. I also had early access to the C++ work being done by Bjarne Stroustrup in 1983. I did most of my programming in C++ from 1984 through 1991. Having full source provided great insight to how C++ was morphed into C, then compiled by the old CFRONT pre-processor. The library code for bsort, tsort and qsort were readily available to see exactly how they were implemented. I had to dig into Knuth's book a couple times when the sort/merge operations were sourced from data files that were 30 MB in size. A challenge on 1980s vintage hardware.