Question

Create A MultiplicationTable program using nested for loops which will display a multiplication table for the hexadecimal numbers 1 - F. Nested for Hint: if you use the System.out.printf method with a format specifier "%X" it will display an integer value in hexadecimal format.

Answer 1

Solution : To calculate the multiplication of each number from 1 to F , we use two for loops, which are nested.The outer for loop iterates from 1 to F(in decimal 15) and the inner for loop iterates from 1 to A(in decimal 10). The resulting multiplication of each number is printed using System.out.print("%X",argument) which prints the numbers in hexadecimal format.

Code :

public class Main {
    public static void main(String[] args) {
        System.out.println("Multiplication table for hexadecimal numbers");
        for (int i = 1; i <= 15; i++) {  // outer for loop for Hexadecimals 1-F

            System.out.printf("%X", i);
            System.out.print(" : ");

            for (int j = 1; j <= 10; j++) { // inner for loop for multiplication upto 10 or in Hexadecimal A
                System.out.printf(" %X", (i * j));
            }
            System.out.println();
        }
    }
}

Output :

We can change the format of our table :

Code :

public class Main {
    public static void main(String[] args) throws Exception {

        System.out.println("Multiplication table for hexadecimal numbers");

        for (int i = 1; i <= 15; i++) {            //outer for loop for Hexadecimals 1-F
            System.out.printf("Table for %X\n", i);

            for (int j = 1; j <= 10; j++) {           //inner for loop for multiplication upto 10 or A(in hexadecimal)
                System.out.printf("%X", i);
                System.out.print(" * ");
                System.out.printf("%X", j);
                System.out.print(" = ");
                System.out.printf(" %X\n", (i * j));
            }
            System.out.println();
        }
    }
}

Output :