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NumberOfDigit.java

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// This program demonstrates a new and most efficient way to calculate number of digits by using logarithmic functions

/* the normal and most used algorithm to calculate number of digits is

while(num>0){

numberOfDigits=num%10;

numberOfDigits++;

num=num%10;

}

this algorithm has a time complexity of O(n)

we can simply calculate it by log(number)+1.

here is the code for it :- */

import java.util.*;

class NumberOfDigit

{

public static void main(String args[])

{

int num=356, digits=0;

digits = (int)Math.log10(num) + 1;

System.out.println(digits);

}