CODEWITHSUNDEEP
javawhile-loop
Eddie Martinez
Eddie Martinez

Reputation: 13910

increment issue within loop in java code

I recently started trying to complete some UVA problems but I got stuck on my first one. the problem is the 3n + 1. I have been able to make some progress and almost completed what was required except for the increment. 

InputStreamReader inputStream = new InputStreamReader(System.in);
BufferedReader buffReader = new BufferedReader(inputStream);

try 
{ 
    String input = buffReader.readLine();
    String[] brokenArray = input.split("\\s");
    int a = Integer.parseInt(brokenArray[0]);
    int b = Integer.parseInt(brokenArray[1]); 
    int c = 1;
    System.out.print(a +" "+b+" "); 

    //if( a <= b )

    while ( a!= b) {
        while (a != 1) { 
            if((a%2)!= 0) {
                c++;
                a = 3*a+1;
            } else {
                c++;
                a = a/2;
            } 
        }
        System.out.println(c); 
        **a ++;**   
    }

so basically its supposed to take 2 inputs and run a count which is c of the operations performed.. but after it finishes counting the operations on a number before getting to one it has to move to the second number therefore I put an increment to move on to the next one. It increments the first time but the variable a at the bottom stays one so im constantly icrementing one rather than incrementing 2, 3, etc.

Upvotes: 0

Views: 136

Answers (2)

Eddie Martinez
Eddie Martinez

Reputation: 13910

well here is the link to the actual problem, sample inputs and sample outputs..

http://uva.onlinejudge.org/external/1/100.pdf

but thanks guys, for shedding light on the problem..I have to initialize a new variable.

Upvotes: 0

2rs2ts
2rs2ts

Reputation: 11066

Your inner loop will always ensure that a == 1 when it ends (because it loops while a != 1, so it ends only when a == 1). Then, your outer loop increments a before it repeats. That is why you are always incrementing 1. So, unless b == 2, you are always going to get stuck.

Upvotes: 2

Related Questions