multiples project no output

[Tim Hoang]

I just made this to get the final answer for this question. "Find the sum of all the multiples of 3 or 5 below 10000." I haven't got no errors on my code, but I also did not get an answer out of my code. What could be the problem?

public class threefive {

	public static void main(String[] args)
	{
		int totalFive;  //number of possible multiples
		int totalThree; //number of possible multiples
		int five;
		int three;
		int totalSum;   //total of both the multiples up to 10000
		int f;
		int t;
	
		
	    five = 5;
		three = 3; 
		totalSum = 0;
		
		f =  10000/five;
		t = 10000/three;
		
		
		if (f == 0 && t == 0)
		{
		System.out.println("This is the total: " + totalSum);
		}
		else
		{
			totalFive = f * 5;
			totalSum=+totalFive;
			
			totalThree = t * 3;
			totalSum=+ totalThree; 
			t--;
			f--;
		
		}
		
	}
}

[Pramod P Deore]

Hi Tim, When these line of code execute

f =  10000/five;
t = 10000/three;

then value of f and t becomes 2000 and 3333 respectively. so it will not enter into if condition and else condition execute.

[Tim Hoang]

I was just declaring that variable to equal to the max multiple (2000 and 3333), but how come it doesn't go through the if else statement? What should I change then without messing up the rest?

[Pramod P Deore]

Tim Hoang wrote:how come it doesn't go through the if else statement?

Print some statement in else block then you will know that it is executing the else block.

[Pramod P Deore]

In if condition you had written that

 if (f == 0 && t == 0)  

it means when f and t both are zero then only it execute if condition but here value of f and t are 2000 and 3333 respectively. so it is executing else statement.

[Tim Hoang]

oh i knew what happened(i wanted it to be true), what i forgot was for it to loop back in making it true. I added while loop but it doesn't work?

while(f>=0 && t>=0)

[Pramod P Deore]

Try like this:

public class threefive {

	public static void main(String[] args)
	{
		int sum = 0;
		for(int i=0;i<1000;i++)
		{
			if (i%3==0 || i%5==0)
			{
				sum = sum+i;
			}
		}
		System.out.println ("Final sum is "+sum);
	}
}

[Tim Hoang]

Dam your good, nice and simple, i will rework around my code. thanks for giving me an example on using % usefully.

[Pramod P Deore]

Tim Hoang wrote:thanks for giving me an example on using % usefully.

Glad to hear it helps you.