CODEWITHSUNDEEP
java
greenCoder
greenCoder

Reputation: 1

JAVA : "java.util.InputMismatchException" error

new programmer here, just trying to finish my programming assignment (last one of the semester)!

Basically, assignment is as follows: Write a program that reads integers, finds the largest of them, and counts its occurrences. Assume the input ends with 0.

My code: import java.util.Scanner;

public class IntCount {
    public static void main(String[] args) {
        int max;
        int count = 1;
        int num;
        int test = 1;

        Scanner scan = new Scanner(System.in);

        System.out.println("Please enter integers");
        num = scan.nextInt();

        String[] testNums = Integer.toString(num).split("");

        max = Integer.parseInt(testNums[0]);
        System.out.println("TEST MAX = " + max);
        int leng = testNums.length;

        while (leng != 1) {

            if ((Integer.parseInt(testNums[test])) == max) {
            count++;

            }

            if ((Integer.parseInt(testNums[test])) > max) {
            max = Integer.parseInt(testNums[test]);
            }

            leng = leng - 1;
            test = test + 1;

        }

        System.out.println(java.util.Arrays.toString(testNums));

        if (leng == 1) {
            System.out.println("Your max number is: " + max);
            System.out.println("The occurances of your max is: "                +count);
        } else {
            System.out.println("Your max number is: " + max);
            System.out.println("The occurrences of your max is: " +    count);
        }

    }
}

Code will work fine for input such as: 3525550 (max number is 5, occurrences is 4)

Code will not work for input such as: 36542454550 For this iput, I receive the following error: Exception in thread "main" java.util.InputMismatchException: For input string: "36542454550" at java.util.Scanner.nextInt(Unknown Source) at java.util.Scanner.nextInt(Unknown Source) at IntCount.main(IntCount.java:13)

No idea how to fix this and its driving me nuts!! not looking for direct answer, as I wouldn't learn anything, but maybe some guidance on what to do next. Thank you all ahead of time!

Upvotes: 0

Views: 160

Answers (4)

Soto
Soto

Reputation: 679

Here's an example of a program that does what you described: 

public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);
    SortedMap<Long, Integer>  maxMap = new TreeMap<>();
    Long newLong = null;

    do {
        System.out.println("Please Enter a Integer: ");
        newLong = scan.nextLong();  
        int count = maxMap.containsKey(newLong) ? maxMap.get(newLong) : 0;
        maxMap.put(newLong, ++count);
    } while (newLong.intValue() != 0);

    System.out.println("Max number is: " + maxMap.lastKey());
    System.out.println("Count: " + maxMap.get(maxMap.lastKey()));
    scan.close();
}

Upvotes: 0

Invisible
Invisible

Reputation: 112

I recommend you to use bigInteger in this kind of situations, you can see more information about bigIntegers here: BigIntegers

Upvotes: 0

Martin Hansen
Martin Hansen

Reputation: 2101

Integers have a max value of 2147483647. The number in your input bigger. Scan for a long instead of int.

Alternatively, scan for a String (since you're already converting your Integer to a string).

Upvotes: 2

user1231232141214124
user1231232141214124

Reputation: 1349

36542454550 is too big of a number to hold in an int

Try using double or long

The max value for a signed integer is 2147483647

Upvotes: 0

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