nested for-loop
hi.write a program that will prompt the user for a positive integer(num) and then display two triangles with num number of lines to represent the following patterns of asterisks. the input num must be validated, and if invalid, the user must be allowed a maximum of 3 tries to enter the correct value.
e.g if the user enters 2,the program must display the following patterns:
*
**
**
*
View Answers
April 9, 2012 at 4:24 PM
import java.util.*;
class Triangle
{
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
System.out.print("Enter positive number: ");
int num=input.nextInt();
for(int i=1;i<=num;i++){
for(int j=1;j<=i;j++){
System.out.print("*");
}
System.out.println();
}
for(int i=num;i>=1;i--){
for(int j=1;j<=i;j++){
System.out.print("*");
}
System.out.println();
}
}
}
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