Question

Java: makes sure program compiles before posting.

Write a program that uses nested for loops to create the pattern of Xs and Os, in which on every line each letter is displayed one additional space to the right. Use a toggle variable ( a boolean flag) to alternate between X and O to produce output as shown in the sample run below:

Enter the number of lines: 7

X
O
X
O
X
O
X

Answer 1

import java.util.Scanner;
class Main{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
  
// taking user input
System.out.print("Enter the number of lines: ");
int n = sc.nextInt();
  
// looping for n times
for(int i=0;i<n;i++)
{
// printing spaces
for(int j=0;j<=i;j++)
{
System.out.print(" ");
}
  
// condition to print either x or 0
if(i%2==0)
System.out.println("X");
else
System.out.println("0");
}
}
}
/*SAMPLE OUTPUT
Enter the number of lines: 9
X
0
X
0
X
0
X
0
X
*/