Custom functions and maths

Programming Questions

hobhob

in Programming Questions • 11 months ago

Hey people, I think I have got quite a tad lost with this.

Here is my question;

Write a function called newNumbers(double a, double b) which takes in two parameters a and b. The function checks if the two numbers are identical or not identical. If identical, the string “a and b are identical” is displayed in the console window, where a and b are the values of a and b. If not identical, the string “ a and b are not identical” is displayed in the console window. Finally, the function should return the sum of a and b if they are not identical, and return either a or b if they are identical

and here is the code I think is the correct answer.. although im getting errors and its not looking complex enough.. any help? Processing is slowly killing my brain.. haha!

int newNumbers(double c, double d)
{
if (c <= d);
println("A and B are identical");
else if (c >= d);
println ("A and B are not identical");
return a = b;
}

Mucho thanks in advance.

Replies(5)

Chrisir

Re: Custom functions and maths

11 months ago

Line 1 : you can Name them a and b

Sign for "is equal" is ==

So 2 Times the = sign in line 3

At the end of if no semi

This is in line 3 and 5

Instead { and

After the Block }

In this blocks, there is println and return

In line 5 just

else {

You call it in setup()

With

newNumbers(3,5);

monkstone

Re: Re: Custom functions and maths

11 months ago

public static boolean equals(double a, double b){ return a == b ? true : Math.abs(a - b) < EPSILON; }

Why?

Do the research you should not rely on others......

Chrisir

Re: [WatchList] Custom functions and maths

11 months ago - via EMail-to-forum

int newNumbers(double c, double d)

{

if (c == d) {

println("A and B are identical");

return c;

}

el_dippo

Re: Custom functions and maths

11 months ago

I bet there are more efficient solutions, but here goes:

double newNumbers(double a, double b) {
if (identical(a, b)) {
println(a + " and " + b + " are identical");
return a;
}
println(a + " and " + b + " are not identical");
return a + b;
}
boolean identical(double a, double b) {
if (a == b)
return true;
return false;
}
void setup() {
println("the sum (if not identical) " + newNumbers(5, 5));
}

quarks

Re: Custom functions and maths

11 months ago

When doing something like this it is worth structuring the problem without thought the the programming language. In this case the problem logic can be written as

If a is equal to b
      display equality message
      return the value of a or b (does not matter which since they are the same
else
      display inequality message
      return the sum of a and b

Now converting this to a function we have

double newNumbers(double a, double b){
if(a == b) {
println("a and b are not identical");
return a;
}
else {
println("a and b are not identical");
return a + b;
}
}

Note that the semicolon (;) is used to seperate statemnets in Java in the same way that the full-stop is used to seperate sentences in text. So the statement

if (c <= d);

does nothing because it is a separate stament from the line below it in your code. What will happen is that it will evaluate the expression (c <= d) and then promptly ignore it.

Notice that I have changed the return type to from int to double (line 1) since the actual value returned will be of type double.

I have replaced the c & d with a & b because the problem statement specified these identifiers.

I would not normally do your homework for you but you have made a real effort and posted some code, also it is obvious that you are new to programming and any answer had to reflect that.

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