Thread: Write a Java program that accepts an integer (n) and computes the value of n+nn+nnn.

import java.util.Scanner;
 
class RicMain 
{    
	public static void main(String[] args) 
	{
		Scanner ip = new Scanner(System.in);
		int n, m;
 
		System.out.print("Input number: ");
		n = ip.nextInt();
 
		System.out.printf("%d + %d%d + %d%d%d", n, n, n, n, n, n);
 
		m = n + 11*n + 111*n;
		System.out.println(" = " + m);
	}
}

My problem is, for m = n + 11*n + 111*n, it works for numbers 1 - 9, but for 10 and above, it wont work because for example
if I input 10, it would output: 10 + 1010 + 101010, but for m, it is wrong because 11 * 10 != 1010. So how do I fix this?

It prints "1010" because you're just concatenating the String "10" twice with System.out.printf("%d + %d%d + %d%d%d", n, n, n, n, n, n). If you want it to print the individual values of 10*1, 10*11, and 10*111, you could store each answer in a separate int and print those ints. Something like this:

int n1 = n * 1;
int n2 = n * 11;
int n3 = n * 111;
 
System.out.printf("%d + %d + %d", n1, n2, n3); // Prints 10 + 110 + 1110 = 1230
 
m = n1 + n2 + n3;
(etc)

Hope that helps!