Computer Applications
Write a program to display all Pronic numbers in the range from 1 to n.
Hint: A Pronic number is a number which is the product of two consecutive numbers in the form of n * (n + 1).
For example;
2, 6, 12, 20, 30,………..are Pronic numbers.
Answer
import java.util.Scanner;
public class KboatPronicNumber
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter the number: ");
int n = in.nextInt();
System.out.println("Pronic numbers from 1 to " + n + " :");
for (int i = 1; i <= n; i++) {
for(int j = 1; j <= i-1; j++) {
if (j * (j + 1) == i) {
System.out.print(i + " ");
break;
}
}
}
}
}Variable Description Table
Program Explanation
Output
Related Questions
You can multiply two numbers 'm' and 'n' by repeated addition method.
For example, 5 * 3 = 15 can be performed by adding 5 three times ⇒ 5 + 5 + 5 = 15Similarly, successive subtraction of two numbers produces 'Quotient' and 'Remainder' when a number 'a' is divided by 'b' (a>b).
For example, 5/2 ⇒ Quotient = 2 and Remainder = 1
Follow steps shown below:Process Result Counter 5 - 2 3 1 3 - 2 1 2 Sample Output: The last counter value represents 'Quotient' ⇒ 2
The last result value represents 'Remainder' ⇒ 1Write a program to accept two numbers. Perform multiplication and division of the numbers as per the process shown above by using switch case statement.
Using a switch statement, write a menu driven program to:
(a) generate and display the first 10 terms of the Fibonacci series
0, 1, 1, 2, 3, 5
The first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the previous two.(b) find the sum of the digits of an integer that is input by the user.
Sample Input: 15390
Sample Output: Sum of the digits = 18
For an incorrect choice, an appropriate error message should be displayed.Write a program to accept a number and check whether it is a 'Spy Number' or not. (A number is spy if the sum of its digits equals the product of its digits.)
Example: Sample Input: 1124
Sum of the digits = 1 + 1 + 2 + 4 = 8
Product of the digits = 1*1*2*4 = 8Write a program to input a number and check whether it is a Harshad Number or not. [A number is said to be Harshad number, if it is divisible by the sum of its digits. The program displays the message accordingly.]
For example;
Sample Input: 132
Sum of digits = 6 and 132 is divisible by 6.
Output: It is a Harshad Number.
Sample Input: 353
Output: It is not a Harshad Number.