Java: Displays the weekday between 1 and 7
Java Conditional Statement: Exercise-5 with Solution
Write a Java program that takes a number from the user and generates an integer between 1 and 7. It displays the weekday name.
Test Data
Input number: 3
Pictorial Presentation:

Sample Solution:
Java Code:
import java.util.Scanner;
public class Exercise5 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input number: ");
int day = in.nextInt();
System.out.println(getDayName(day));
}
// Get the name for the Week
public static String getDayName(int day) {
String dayName = "";
switch (day) {
case 1: dayName = "Monday"; break;
case 2: dayName = "Tuesday"; break;
case 3: dayName = "Wednesday"; break;
case 4: dayName = "Thursday"; break;
case 5: dayName = "Friday"; break;
case 6: dayName = "Saturday"; break;
case 7: dayName = "Sunday"; break;
default:dayName = "Invalid day range";
}
return dayName;
}
}
Sample Output:
Input number: 3 Wednesday
Flowchart:

Java Code Editor:
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Java: Tips of the Day
IsPowerOfTwo
Checks if a value is positive power of two.
To understand how it works let's assume we made a call IsPowerOfTwo(4).
As value is greater than 0, so right side of the && operator will be evaluated.
The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.
The result of (value & value) is value. 100 & 100 => 100.
This will value the expression to true as value is equal to value.
public static boolean isPowerOfTwo(final int value) { return value > 0 && ((value & (~value + 1)) == value); }
Ref: https://bit.ly/3sA5d4I
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