Fascinating Number in Java

Situatie

Multiplying a number by two and three separately, the number obtained by writing the results obtained with the given number will be called a fascinating number. If the result obtained after concatenation contains all digits from 1 to 9, exactly once.

In other words, we can also say that a number (n) may be a fascinating number if it satisfies the following two conditions:

If the given number is a 3 or more than three-digit
If the value getting after concatenation contains all digits from 1 to 9, exactly once.

For example, 192, 1920, 2019, 327, etc. Let’s understand the concept of fascinating numbers through an example.

Backup

import java.util.*;
public class FascinatingNumberExample1
{
public static void main(String args[])
{
int num, n2, n3;
Scanner sc=new Scanner(System.in);
System.out.print(“Enter any Number: “);
num = sc.nextInt();
n2 = num * 2;
n3 = num * 3;
//concatenating num, n2, and n3
String concatstr = num + “” + n2 + n3;
boolean found = true;
//checks all digits from 1 to 9 are present or not
for(char c = ‘1’; c <= ‘9’; c++)
{
int count = 0;
//loop counts the frequency of each digit
for(int i = 0; i < concatstr.length(); i++)
{
char ch = concatstr.charAt(i);
//compares the character of concatstr with i
if(ch == c)
//incerments the count by 1 if the specified condition returns true
count++;
}
//returns true if any of the condition returns true
if(count > 1 || count == 0)
{
found = false;
break;
}
}
if(found)
System.out.println(num + ” is a fascinating number.”);
else
System.out.println(num + ” is not a fascinating number.”);
}
}

Output 1:

Enter any Number: 327
327 is a fascinating number.

Output 2:

Enter any Number: 8975
8975 is not a fascinating number.

Solutie

Tip solutie

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