Java: Extract the first digit from an integer
Java Method: Exercise-20 with Solution
Write a Java method for extracting the first digit from a positive or negative integer.
Pictorial Presentation:

Sample data:
(1234) ->1
(-2345) ->2
Sample Solution:
Java Code:
import java.util.Scanner;
public class Main {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input an integer(positive/negative):");
int n = in.nextInt();
System.out.print("Extract the first digit from the said integer:\n");
System.out.print(test(n));
}
public static int test(int n){
int fact_num = 10;
while(n / fact_num != 0){
fact_num *= 10;
}
return Math.abs(n / (fact_num/10));
}
}
Sample Output:
Input an integer(positive/negative): 1234 Extract the first digit from the said integer: 1
Flowchart :
Java Code Editor:
Contribute your code and comments through Disqus.
Previous Java Exercise: Accept three integers and return the middle one.
Next Java Exercise: Display the factors of 3 in a given integer
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Java: Tips of the Day
DropElements
Removes elements in an array until the passed function returns true. Returns the remaining elements in the array.
Loop through the array, using Arrays.copyOfRange() to drop the first element of the array until the returned value from the function is true. Returns the remaining elements.
public static int[] dropElements(int[] elements, IntPredicate condition) { while (elements.length > 0 && !condition.test(elements[0])) { elements = Arrays.copyOfRange(elements, 1, elements.length); } return elements; }
Ref: https://bit.ly/37YWqzD
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook