Objective-C

Question 1

What MAC program is used to create iPhone & iPad apps?

Answer 1

XCode

Question 1

How is Objective C different from C?

Answer 1

Objective-C adds support for Object Oriented programming to C.

Question 2

What is a function?

Answer 2

A list of instructions for the processor to execute.

Question 2

What is a function?

Answer 2

A list of instructions

Question 3

What is a program?

Answer 3

A collection of functions

Question 4

What does the Compiler do?

Answer 4

The Compiler translates functions into machine code.

Question 5

What is a Variable?

Answer 5

A place where one piece of data can be stored for later use.

Question 6

What is contained in a Variable?

Answer 6

A name, a type (such as a number), and sometimes a value.

Question 7

Why declare a type for a variable?

Answer 7

1. To let the compiler check your work for you and alert you to problems; and
2. To tell the compiler how much memory to set aside.

Question 8

short, int, long

Answer 8

These 3 Types are whole numbers with no decimal point.

Question 9

float, double

Answer 9

These are Types for floating point numbers (numbers with decimal places).

Question 10

char

Answer 10

A one byte Type usually a character such as the letter “a”.

Question 11

What are pointers?

Answer 11

A pointer holds a memory address. It is declared using an *. It does not hold the value. It holds the address to where the value is stored.

Question 12

struct

Answer 12

A struct is short for structure. It is a Type made of other Types. Example if you wanted to use a GeoLocation Type you would use 2 Float Types that contained a Latitude and a Longitude.

Question 13

What is a Boolean variable?

Answer 13

A variable that can be true or false. It is expressed as BOOL in Obj-C.

Question 14

What is a conditional operator and how does it use “?”

Answer 14

A conditional operator (or ternary operator) uses the if a=x else b=y structure by using the ? as a quick way to write the same as “a ? x : y” implying “: y” as else.

Question 15

What is in a Parameter in a function?

Answer 15

Each parameter has 2 parts: the type of data the argument presents and the name of the parameter. Ex: “int numDays” or “char *firstName”