Java: Reads an positive integer and count the number of digits
Java Conditional Statement: Exercise-29 with Solution
Write a Java program that reads an positive integer and count the number of digits the number (less than ten billion) has.
Test Data
Input an integer number less than ten billion: 125463
Pictorial Presentation:

Sample Solution:
Java Code:
import java.util.Scanner;
public class Exercise29 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input an integer number less than ten billion: ");
if (in.hasNextLong())
{
long n = in.nextLong();
if (n < 0)
{
n *= -1;
}
if (n >= 10000000000L)
{
System.out.println("Number is greater or equals 10,000,000,000!");
}
else
{
int digits = 1;
if (n >= 10 && n < 100)
{
digits = 2;
}
else if (n >= 100 && n < 1000)
{
digits = 3;
}
else if (n >= 1000 && n < 10000)
{
digits = 4;
}
else if (n >= 10000 && n < 100000)
{
digits = 5;
}
else if (n >= 100000 && n < 1000000)
{
digits = 6;
}
else if (n >= 1000000 && n < 10000000)
{
digits = 7;
}
else if (n >= 10000000 && n < 100000000)
{
digits = 8;
}
else if (n >= 100000000 && n < 1000000000)
{
digits = 9;
}
else if (n >= 1000000000 && n < 10000000000L)
{
digits = 10;
}
System.out.println("Number of digits in the number: " + digits);
}
}
else
{
System.out.println("The number is not an integer");
}
}
}
Sample Output:
Input an integer number less than ten billion: 125463 Number of digits in the number: 6
Flowchart:

Java Code Editor:
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Previous: Write a Java program that reads a floating-point number. If the number is zero it prints "zero", otherwise, print "positive" or "negative". Add "small" if the absolute value of the number is less than 1, or "large" if it exceeds 1,000,000.
Next: Write a Java program that accepts three numbers and prints "All numbers are equal" if all three numbers are equal, "All numbers are different" if all three numbers are different and "Neither all are equal or different" otherwise.
What is the difficulty level of this exercise?
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Java: Tips of the Day
IsPowerOfTwo
Checks if a value is positive power of two.
To understand how it works let's assume we made a call IsPowerOfTwo(4).
As value is greater than 0, so right side of the && operator will be evaluated.
The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.
The result of (value & value) is value. 100 & 100 => 100.
This will value the expression to true as value is equal to value.
public static boolean isPowerOfTwo(final int value) { return value > 0 && ((value & (~value + 1)) == value); }
Ref: https://bit.ly/3sA5d4I
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