Adding two or more nested for loops in a JAVA programme

Question

I am just a beginner in JAVA and while doing a class tutorial I got this problem. This is the output I should get:

  1    
 123
12345
 123
  1

I wrote this code and it gives a compilation error at line 16 saying that "for(int k=1; k<=5-i; k++)" is an unreachable statement.

public class CaseThree{
	public static void main (String[] args){
		for(int a=1; a<=3; a++){
			for(int b=1; b<=3-a; b++){
				System.out.print(" ");
				}
			for(int c=1; c<=2*a-1; c++){
				System.out.print(c);
				}
			System.out.println();
			}
		for(int i=1; i<=2; i++){
			for(int j=1;; j++){
				System.out.print(" ");
				}
			for(int k=1; k<=5-2*i; k++){
				System.out.print(k);
			}
			System.out.println();
		}
	}
}

What is wrong with this code? (Our lecturer told us to use two separate nested for loops.)

Answer 1

Look at the code right before the statement that the compiler says that is impossible to reach

for(int j=1;; j++){
    System.out.print(" ");
}

the validation expression is empty, hence this is an infinite loop which explain the compilation error.