﻿ Java: Add one to the number of positive numbers in an array

# Java Exercises: Plus one to the number of a specified positive numbers represented as an array of digits

## Java Basic: Exercise-179 with Solution

Write a Java program to plus one to the number of a given positive numbers represented as an array of digits.

Sample array: [9, 9, 9, 9] which represents 9999
Output: [1, 0, 0, 0, 0].

Sample Solution:

Java Code:

``````import java.util.*;
public class Solution {
public static void main(String[] args) {
int[] nums = {9,9,9,9};
System.out.println("Original array: " + Arrays.toString(nums));
System.out.println("Array of digits: " + Arrays.toString(plus_One_digit(nums)));
}
public static int[] plus_One_digit(int[] digits_nums) {
for (int i = digits_nums.length - 1; i > -1; --i) {
if (digits_nums[i] != 9) {
digits_nums[i] += 1;
for (int j = i + 1; j < digits_nums.length; ++j) {
digits_nums[j] = 0;
}
return digits_nums;
}
}
int[] result = new int[digits_nums.length + 1];
result = 1;
return result;
}
}
```
```

Sample Output:

```Original array: [9, 9, 9, 9]
Array of digits: [1, 0, 0, 0, 0]
```

Flowchart: Java Code Editor:

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## Java: Tips of the Day

Java: ConvertInputStreamToString

Converts InputStream to a String.

```public static String convertInputStreamToString(final InputStream in) throws IOException {
ByteArrayOutputStream result = new ByteArrayOutputStream();
byte[] buffer = new byte;
int length;
while ((length = in.read(buffer)) != -1) {
result.write(buffer, 0, length);
}
return result.toString(StandardCharsets.UTF_8.name());
}
```

Ref: https://bit.ly/2N1GDss