Hackharbor 3.0 Day 4:C

What is the key difference between a structure and a union in C?

• Structure shares memory among members, union does not

• Union shares memory among members, structure does not

• Structure allows only one member, union allows multiple

• Both allocate memory exactly the same way

What does a struct say to a union at a party?

• “I like my space, you share yours”

• “Youʼre occupying my memory!”

• “Letʼs combine and confuse the compiler!”

• “Letʼs be friends forever!”

Which operator is used to access members of a structure variable in C?

• meow

• . (dot)

• &

• *

Which of the following keywords is used to define a user-defined data type combining different data types?

• class

• union

• struct

• typedef

What will happen if you assign a value to one member of a union and then assign another value to a different member?

• Both values get stored separately

• The latter assignment overwrites the first value

• Compiler error

• Both values remain unchanged

Why are structure members always calm?

• Because they each have their own space to chill

• They work too hard to care

• They donʼt share memory, so no conflicts

• They meditate regularly

In a union, what is the size of the memory block allocated?

• Sum of all membersʼ sizes

• Size of the smallest member

• Size of the largest member

• None of the above

Why did the union break up with the structure?

• They fought over memory space

• The structure was too possessive with data

• Union wanted to share but structure kept everything separated

• Because union was always changing personalities!

Which file mode opens a file for writing only and creates the file if it does not exist?

• r

• w

• a

• r+

If a file could talk, what would it say when closed?

• “Thanks for the RAM!”

• “Donʼt forget to fclose me!”

• “Iʼm done, go to sleep!”

• “Hey coder, save me!”