HP BASIC for OpenVMS is a programming language created in 1982.
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HP BASIC for OpenVMS is the latest name for a dialect of the BASIC programming language created by Digital Equipment Corporation (DEC) and now owned by Hewlett-Packard Enterprise (HPE). It was originally developed in the 1970s for the RSTS-11 operating system on the PDP-11 minicomputer. It was later ported to OpenVMS, first on VAX, then Alpha, and most recently Integrity. Read more on Wikipedia...
10 PRINT "Enter a temperature in Celsius ";
INPUT C
when error in
X = REAL(C)
PRINT "Temperature in degrees Fahrenheit is "; (X * 1.8) + 32
use
PRINT "Error: Enter a valid numeric value."
end when
40 END