1. Write a class that prompts the user to enter the edge of a square, then use a

Question

1.      Write a class that prompts the user to enter the edge of a square, then use asterisks to displays it (hollow with an empty body). The edge must be a number from 1 to 30. If edge is out of range, the program should display an error message and allow the user to enter a new value of edge.

Sample Run 1:

Enter the square edge: -4

Invalid edge. Please re-enter the edge: -10

Invalid edge. Please re-enter the edge: -40

Invalid edge. Please re-enter the edge: 5

* *  *  *   *

*            *

*           *

*           *

* *  *   *  *

Explanation / Answer

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import java.util.*;
public class main
{public static void main(String args[])
{Scanner in=new Scanner(System.in);
int edge,i,j;
System.out.print("enter the square edge:");
edge=in.nextInt();
while(edge<1||edge>30)
   {System.out.print("Invalid edge. Please-enter the edge:");
    edge=in.nextInt();
    }
for(i=0;i<edge;i++)
      System.out.print("*");
System.out.println();
for(i=1;i<edge-1;i++)
    {System.out.print("*");
    for(j=1;j<edge-1;j++)
       System.out.print(" ");
     System.out.println("*");
     }
for(i=0;i<edge;i++)
      System.out.print("*");
System.out.println();
}

}

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