Input in Java

Chapter 6

Input in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Time Period of a Simple Pendulum

Write a program to compute the Time Period (T) of a Simple Pendulum as per the following formula:

Input the value of L (Length of Pendulum) and g (gravity) using the Scanner class.

import java.util.Scanner;
 
public class SimplePendulum {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        // Input values
        System.out.print("Enter the length of the pendulum (L): ");
        double L = sc.nextDouble();
 
        System.out.print("Enter the value of gravity (g): ");
        double g = sc.nextDouble();
 
        // Calculation
        double T = 2 * Math.PI * Math.sqrt(L / g);
 
        // Output
        System.out.println("\nTime Period of the Pendulum = " + T + " seconds");
 
        sc.close();
    }
}
 

 
SAMPLE INPUT : 
Enter the length of the pendulum (L): 1
Enter the value of gravity (g): 9.8

SAMPLE OUTPUT : 
Time Period of the Pendulum = 2.0060666807106475 seconds

Explanation

The time period of a simple pendulum is calculated using the formula:

Where:

• L = Length of the pendulum
• g = Acceleration due to gravity
• π (Pi) = 3.14159 (provided by Math.PI)

Java Methods Used:

• Math.PI → provides the value of π
• Math.sqrt() → calculates square root

✅ Key Concepts Used

• Scanner class for user input
• Mathematical expressions
• Math.PI and Math.sqrt()

Formatted Output

System.out.printf("Time Period of the Pendulum = %.2f seconds", T);