Write a program that asks the user to enter the size of a triangle (an integer from 1 to 50) and validate this input. Make sure that your program loops until it receives valid input. Display the triangle by displaying lines of asterisks.

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
{

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)