To quotation marks used for command substitution (executing a command) is
a. "command" (double quotation marks)
b. ' command ' (single quotation marks)
c. ` command ` (single back quotation marks - grave accent)
d. all of the above
e. none of the above
c. ` command ` (single back quotation marks - grave accent)
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Provide the equivalent domain relational calculus and relational algebra expressions for each of the tuple relational calculus expressions given in Exercise 4.10.
(a) {H.hotelName | Hotel(H) ? H.city = ‘London’} (b) {H.hotelName | Hotel(H) ? (?R) (Room(R) ? H.hotelNo ? R.hotelNo?? R.price ? 50)} (c) {H.hotelName | Hotel(H) ? (?B) (?G) (Booking(B) ? Guest(G) ? H.hotelNo ? B.hotelNo?? B.guestNo = G.guestNo ?? G.guestName = ‘John Smith’)} (d) {H.hotelName, G.guestName, B1.dateFrom, B2.dateFrom | Hotel(H) ? Guest(G) ? Booking(B1) ? Booking(B2) ? H.hotelNo ? B1.hotelNo?? G.guestNo = B1.guestNo ?? B2.hotelNo = B1.hotelNo ? B2.guestNo = B1.guestNo ?? B2.dateFrom ? B1.dateFrom}
Using ____ letters is customary in C++ to make const identifiers easy to identify.
A. lowercase B. italic C. bold D. uppercase
Grounding yourself means putting yourself and a computer part at the same voltage
Indicate whether the statement is true or false
The ____________________ type is C++ 's method for allowing programmers to create their own simple data types.
Fill in the blank(s) with the appropriate word(s).