Question

Write a java program that will print out the following patters. Use nested for loop.
1
01
101
0101
10101

Answer 1

The below java program with appropriate comments explaining the logic within the for loops will print the given pattern (here n=5, the number of lines to be printed)

PROGRAM :

public class Solution
{
public static void main(String[] args) {
int n = 5; // number of lines
for (int i = 1; i <= n; i++) { // loop for controlling number of lines (5 in this case)
for (int j = 1; j <= i; j++) { // loop for controlling number of digits per line (vary with each line)
if ((i + j) % 2 == 0) { // condition check, if i+j is divisible by two - print 1 otherwise print 0
System.out.print("1 ");
} else {
System.out.print("0 ");
}
}
System.out.println();
}
}
}