Objective-c Coding Test
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Objective-C is a general-purpose, object-oriented programming language derived from the C programming language. It was the main programming language used by Apple for their OS X and iOS operating systems prior to the introduction of SWIFT. After all that history, I am sure you will want to know more about this programming language. Find out how much you know by attempting this quiz.
- 1.What is the file extension name used for Objective-C code?
- A.
.c
- B.
.pl
- C.
.m
- D.
.cpp
- 2.What does the leading + sign at the start of a method indicate?
- A.
An instance method
- B.
A class method
- C.
An initialization method
- D.
None of the above
- 3.What is the value of s after executing this loop: int i = 0, s = 0; while (i < 5) s += ++i;
- A.
16
- B.
15
- C.
14
- D.
11
- 4.What is the value of z after executing this sequence (check indentation)? int x = 100, y = 50, z = -1; if ( x + y > 50) if ( x + y < 100) z = 0; else z = 1;
- A.
-1
- B.
0
- C.
1
- D.
This problem is too hard!
- 5.What is a local variable that has no default initial value and does not retain its value through method calls?
- A.
A static variable
- B.
An auto variable
- C.
A global variable
- D.
None of the above
- 6.What is wrong with this sequence of code? sum = 100; int sum;
- A.
"sum" is a reserved word
- B.
A variable must be declared before it can be used
- C.
Nothing is wrong
- D.
Everything is wrong! I hate Objective-C!
- 7.Given int a = 10, b = 20, c; b *= a + 5; What is the resulting value of b?
- A.
205
- B.
200
- C.
300
- D.
The statement will generate a compiler error
- 8.Which is an example of an invalid variable name?
- A.
Floats
- B.
X123$
- C.
Two_By_Four
- D.
_Rectangle
- 9.What should you do If you want to return an object back to the caller of your method and you want to mark the object for a later release?
- A.
Autorelease it before returning
- B.
Copy it before returning
- C.
Release it before returning
- D.
Retain it before returning
- 10.Which value is not equivalent to the others?
- A.
0x64
- B.
0144
- C.
100
- D.
0XE5
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