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If we're counting only programming languages (and not fill-out forms), Prolog had it in 1971, before ML. ASCII didn't include _ until its 1963 draft, so it's pr
by lieks 2y ago
If we're counting only programming languages (and not fill-out forms), Prolog had it in 1971, before ML. ASCII didn't include _ until its 1963 draft, so it's probably somewhere in that time.
I'll guess it's probably Prolog, but maybe Planner (Prolog's predecessor) had it too.
- fanf2 2y agoASCII 1963 was the first version of the standard and it lacked _ https://dl.acm.org/doi/10.1145/366707.367524 https://dl.acm.org/doi/10.1145/366707.367524 The 1965 draft had _ https://dl.acm.org/doi/10.1145/363831.363839 https://dl.acm.org/doi/10.1145/363831.363839 The first standard edition with _ was 1968 https://www.rfc-editor.org/info/rfc20 https://www.rfc-editor.org/info/rfc20 The 1977 version is also available https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub1-2-1977.pdf https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub1-2-197...