Having trouble answering quiz on objective C

First of, float is a datatype like any other available (like Int, Char, Double etc.).

Int = Integer (e.g. 4 or 10)

Float = Floating number up to 7 decimals (e.g. 1.0054 or 10.55555)

Double = Is also a floating number but up to 2 times larger: up to 15 or 16 decimals. (e.g. 1.5353415335)

Char = A Character (e.g. 'a' or 'G').

These are the most popular datatypes.

What you want to do in some programming languages like Objective-C in this case; is to tell the compiler what type the variable will have. If you're going to give the variable x = 1 then you must tell the compiler before you do that. You will need to change to declaration to: int x = 1. The same rules follows with the float and other datatypes.

An argument to a function is like Math in high-school. (example):

f(x) = 5x + 1.

or

f(x,y) = x + y.

The last function take two arguments: x and y.

The same logic is used in programming except that you tell the compiler what type the function will return.

f(x,y) = x + y

Will be in C-programming if you use Integers:

int f(int x, int y) { return x + y }

Your answer will probably be:

(in C):

float addTwo(float first, float second) {

    return first + second;

}

(in Objective-C):

- (float)addTwo:(float)first secondArgument:(float)second  {

    return first + second;

}

I don't know which one they're asking for.

the same way, you can first declare variable in your first line and in the second you implement your function. sorry about my English but the code is correct

float addTwo (float a, float b); float addTwo (float a, float b) { return a +b; }

Thankyou very much guys! I understand this a lot better now!