Thread: What should I do?

And which part of your task is it you are struggling with?

How to mathematically determine if integer A is a multiple of integer B?
How to write a function in general, or something else?

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Mats

So, what do you do if I say "Is 111 a multiple of 3" - you have pen and paper at hand.

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Mats

Originally Posted by matsp

So, what do you do if I say "Is 111 a multiple of 3" - you have pen and paper at hand.

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Mats

Well, 1 + 1 + 1 = 3. So of course 111 is a multiple of 3.


Or is it? dun, dun dun...

Perhaps a bigger hint than matsp's,
7 / 2 = 3 remainder 1
6 / 2 = 3 remainder 0

Originally Posted by zacs7

Well, 1 + 1 + 1 = 3. So of course 111 is a multiple of 3.


Or is it, dun, dun dun...

That is of course one way. That only works for 3 tho', so if I ask if 111 is a multiple of, say, 7, you can't use that method.

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Mats

Originally Posted by jturner38

Yes it is. So as long as the the digits add up to be a multiple of 3 then its a multiple of 3? Is that right?

Yes, 3 is a "magical" number this way:
21 for example, or 63, or 18 are all multiples of three, and the sum of the numbers is a multiple of three. But it doesn't work for any other "A is multple of B", e.g. 25 does not make a sum of it's numbers that make 5 - but it is a multiple of 5.

So you need to work out something that works for ALL numbers.

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Mats

There is a very simple way to check if a value is a multiple of another value, yes, no matter what the different values are.

--
Mats

Originally Posted by jturner38

Ok well in the second function after my main function. Would i use a for loop. How would u put it? I have it like this:

Stop. The first part of your requirements asks you to do this: "Write a function multiple that determines for a pair of integers whether the second integer is a multiple of the first."

I want to see your code for this function first. I also want to see you write the main function such that it calls this function with the values 10 and 5 as arguments, and based on the result prints whether 10 is a multiple of 5.

If you cannot get the above right, there is no point going further. At a glance, you need to grasp some basic syntax first, otherwise you are going to end up with a program that so badly needs to be fixed that you might as well give up and rewrite it from scratch.

Originally Posted by jturner38

int multiple;

this is variable definition
you want function declaration:

int multiply(int x, int y);

scanf("%d", x);

should be

scanf("%d", &x);

m = int multiple(a)

should be
m = multiply(x,y);

and do not forget tp print value of m afterwards

Code:

int multiple {
	int a;

	a = x % y;

	if(a==0)
        printf("The second integer is a multiple of the first");
		return 1;
	if(a==1)
		printf("The second integer is not a multiple of the first");
		return 0;

should start as

Code:

int multiply(int x, int y) {

if(a == 1) should be removed - a could be any value from 1 to y-1

also 2 statements after if(a ==0) should be placed inside

Code:

{}