"Single Entry, Single Exit" was written when most programming was done in assembly language, FORTRAN, or COBOL. It has been widely misinterpreted, because modern languages do not support the practices Dijkstra was warning against.
"Single Entry" meant "do not create alternate entry points for functions". In assembly language, of course, it is possible to enter a function at any instruction. FORTRAN supported multiple entries to functions with the ENTRY statement:
Read full article from coding style - Where did the notion of "one return only" come from? - Software Engineering Stack Exchange
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