Lecture "Programming languages", exercise 2

[essepuntato]

What is the boolean value of "spam" not in "spa span sparql" and not ("egg" > "span")?

[ghasempouri1984]

True.
"spam" not in "spa span sparql" = True
not ("egg" > "span") = not (False) = True
True and True = True

[ManueleVeggi]

I think the solution is True. Indeed, “spam” in "spa span sparql" = F and “egg” > “span” = F. As a consequence, the question can be interpreted as following:

"spam" not in "spa span sparql" and not ("egg" > "span")
not False and not False
True and True = True

[tommasobattisti]

The value is True:

• "spam" not in "spa span sparql" = True
• not ("egg" > "span") = True

So,
"spam" not in "spa span sparql" and not ("egg" > "span") =
True and True =
True

[federicabonifazi]

"spam" not in "spa span sparql" and not ("egg" > "span")=
True and not(False)=
True and True=
True

[OrsolaMBorrini]

The answer is: True

"spam" not in "spa span sparql" and not ("egg" > "span")

• "spam" not in "spa span sparql" = True
• not ("egg" > "span") = not (False) = True
• True and True = True

[CarmenSantaniello]

The value is True, because spam not in "spa span sparql" = True and not ("egg" > "span") = not False
Then not False = True, so True and True = True.

[angstigone]

"spam" not in "spa span sparql" and not ("egg" > "span")

"spam" not in "spa span sparql" and not (False)
"spam" not in "spa span sparql" and True
True and True
True

[alt-manu]

"spam" not in "spa span sparql" = True
"not("egg">"span") = not(False) = True

Note, python uses unicode to compare strings and compares them character by character. Here, the unicode value of 'e from egg' is smaller than 's from span' as e comes before in the alphabets and in the unicode. It gives us the the result false which gets converted to true with the help of not operation.

now the final equation looks like : True and True = True.

Thus the final output will be True or 1

[Pablo751]

1)not 2)and 3)or

"spam" not in "spa span sparql" and not ("egg" > "span")
"spam" not in "spa span sparql" and (not ("egg" > "span"))
("spam" not in "spa span sparql") and (not ("egg" > "span"))
(true) and (not (false))
(true) and (not false))
true and true = true

[olgagolgan]

the Boolean value is True

"spam" not in "spa span sparql" and not False = True

[elizastuglik]

The boolean value of "spam" not in "spa span sparql" and not ("egg" > "span") is True.

[giorgimariachiara]

The boolean value is True

[Bianca-LM]

"spam" not in "spa span sparql" and not ("egg" > "span") = True and not False = True and True = True

[sotarega]

"spam" NOT IN "spa span sparql" and NOT ("egg" > "span")
TRUE and NOT (FALSE)   #because ""egg is lexicographically before "span", so should be “egg” < “span”  
TRUE and TRUE  
TRUE