Java Exercises: Convert a octal number to a hexadecimal number
Java Basic: Exercise-27 with Solution
Write a Java program to convert a octal number to a hexadecimal number.
Octal number: The octal numeral system is the base-8 number system, and uses the digits 0 to 7.
Hexadecimal number: This is a positional numeral system with a radix, or base, of 16. Hexadecimal uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a, b, c, d, e, f) to represent values ten to fifteen.
Test Data:
Input any octal number: 100
Pictorial Presentation: Octal to Hexadecimal number

Sample Solution:
Java Code:
import java.util.Scanner;
public class Exercise27 {
public static void main(String args[])
{
String octal_num, hex_num;
int decnum;
Scanner in = new Scanner(System.in);
System.out.print("Input a octal number : ");
octal_num = in.nextLine();
decnum = Integer.parseInt(octal_num, 8);
hex_num = Integer.toHexString(decnum);
System.out.print("Equivalent hexadecimal number: "+ hex_num+"\n");
}
}
Sample Output:
Input a octal number : 100 Equivalent hexadecimal number: 40
Flowchart:

Java Code Editor:
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Previous: Write a Java program to convert a octal number to a binary number.
Next: Write a Java program to convert a hexadecimal to a decimal number.
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Java: Tips of the Day
countOccurrences
Counts the occurrences of a value in an array.
Use Arrays.stream().filter().count() to count total number of values that equals the specified value.
public static long countOccurrences(int[] numbers, int value) { return Arrays.stream(numbers) .filter(number -> number == value) .count(); }
Ref: https://bit.ly/3kCAgLb
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