שאלות ותשובות - HW3 Frequently Asked Questions - HW3 Вопросы и Ответы - HW3 أسئلة وأجوبة - HW3

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How should the dangling else problem be resolved?

The dangling else should be resolved as in C language. Meaning that: if (a) if (b) ... else ... is interpreted as: if (a) { if (b) ... else ... }

Asuume the statement: bool a = 1 < 2 < 3; Is it valid?

As explained in the precedence table, the relational operators are non-associative, and thus the following: bool a = 1 < 2 < 3; should raise a syntax error.

Casting a byte to an int like so: byte b1 = 5 b; int x = (int) b1; Is it valid?

No. The only valid casting is from an enum type to int.

Assume the following: enum day {SUNDAY, MONDAY}; enum day d = JANUARY; What is the error that should be thrown?

If JANUARY was never defined before, it should be errorUndef. If JANUARY was defined before (as a variable or as an enum value of another enum), it should be errorUndefEnumValue.

Can an enum shadow another identifer?

No. Enum names and values are identifiers, and are not allowed to shadow or be shadowed by another identifier. For example, the following codes are not valid: void main() { int a1; enum a {a1, a2}; //invalid } -- void main() { enum a {a1, a2}; int a2; //invalid }

Can we cast an enum value to an int?

Yes. For example, the following code is valid: enum A {a1, a2, a3}; void main() { int x = (int) a1; enum A y = a2; int z = (int) y; }