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Count Digits in a Number in Java | Java Basics for Beginners

Welcome to CodeWithBK — your go-to hub for mastering Java programming.

In this video, learn how to count the digits in a number in Java step-by-step.
We will explore multiple approaches with clear explanations so that beginners can easily understand the logic behind counting digits.

Example 1:
Input:
n = 100
Output:
3

Example 2:
Input:
n = 1234
Output:
4

We’ll cover:
What does counting digits mean in Java
Using loops and Strings to count digits
Handling negative numbers and zero
String method - to convert the int to String and then find the length of the String
while loop - count number of digits by removing units digit one by one iteratively
Example programs with step-by-step explanation
Common mistakes to avoid

By the end of this video, you will be able to write your own Java program to count the digits in any given number.

Perfect for:
B.Tech / BCA students
Java beginners
Coding interview prep
ICSE Class 10 Computer Applications students
ISC Computer Science Class 11 & Class 12 students
AP Computer Science students learning Java

Programming Language: Java
Level: Beginner-friendly

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Timestamps:
0:00 Intro
0:58 Count digits using the while loop method
4:30 Sample dry run of the Java code to count digits using the while loop method
6:36 Java Code implementation using String method
7:04 Java Code implementation using while loop method

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