Answer:
import java.util.Scanner;
public class num1 {
public static void main(String[] args) {
Scanner in = new Scanner (System.in);
int size;
do{
System.out.println("Enter the size of the traingle");
size = in.nextInt();
}while (size > 50);
//Using nexted for loop to print the triangle
for(int i=0; i<size; i++)
{
for(int j=0; j<=i; j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Explanation:
Use Scanner class to receive user input
Validate using a do while statement while(num>50) keep prompting the user for a valid input
Use nexted for loops to print the triangle (right-angled triangle call a half pyramid with stars)
