Question:-
Nila uses pencils to write at school and at home. When she was in her 1st standard, her parents bought her one pencil. In her 2nd standard, she needed 5 pencils, and in 3rd standard, she needed 14 pencils and so on. How many pencils does she get from the provided standard?
Note : If the input given is not between 1 to 12 then the output should be “Invalid Standard”
Sample Input 1:
Enter the standard: 4
Sample Output 1:
Nila gets 30 pencils
Sample Input 2:
Enter the standard: 5
Sample Output 2:
Nila gets 55 pencils
Sample Input 3:
Enter the standard:14
Sample Output 3:
Invalid Standard
Code:-
import java.util.*; class Count{ public static void main(String args[]){ Scanner sc = new Scanner(System.in); int n, count=0; System.out.println("Enter the standard: "); n= sc.nextInt(); if(n<1 || n>12){ System.out.println("Invalid Standard"); } else{ count = (n*(n+1)*(2*n+1))/6; System.out.println("Nila gets "+count+" pencils"); } } }