1. Write a Java program that reads an integer value n, and it reverses its digit

Question

1. Write a Java program that reads an integer value n, and it reverses its digits. Use either a for or a while loop. D not use arrays.

2. Write a Java program that takes an unput a snumber base 10 (example 51966) and it outputs the corresponding hexadecimal number (CAFE). A hexadecimal number is a number written in base 16 using as sixteen digits, 0 to 9 for the first 10, and A for 10, B for 11, C for 12, D for 13, E for 14, F for 15. For instance: AB3 = 10x16^2+11x16+3X16^0=2739 and CAFE=12x16^3+10x16^2+15x16^1+14x16^0

3. Write a Java program that reads an integer value n, it reads n integer values and it outputs the largest and the smallest of the n integer values. Integers and it outputs their values in increasing order. Use either a for a while loop. Example: How many numbers? 10 Give me the 10 numbers: 7, 21, 5, 12, 14, 2, 1, 34, 9, 6. Smallest number is 1. Largest number is 34

Explanation / Answer

import java.util.Scanner;

/**
* @author Srinivas Palli
*
*/
public class ReverseNumber {

   /**
   * @param args
   */
   public static void main(String[] args) {

       System.out.print("Enter a number: ");

       Scanner in = new Scanner(System.in);
       int reversenum = 0;
       int num = in.nextInt();
       for (; num != 0;) {
           reversenum = reversenum * 10;
           reversenum = reversenum + num % 10;
           num = num / 10;
       }

       System.out.println("Reverse of specified number is: " + reversenum);
   }
}

OUTPUT:
Enter a number: 453
Reverse of specified number is: 354

import java.util.Scanner;

/**
* @author Srinivas Palli
*
*/

class DecimalToHex {
   /**
   * @param args
   */
   public static void main(String args[]) {
       Scanner input = new Scanner(System.in);
       System.out.print("Enter a decimal number : ");
       int num = input.nextInt();

       // For storing remainder
       int rem;

       // For storing result
       String str2 = "";

       // Digits in hexadecimal number system
       char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
               'B', 'C', 'D', 'E', 'F' };

       while (num > 0) {
           rem = num % 16;
           str2 = hex[rem] + str2;
           num = num / 16;
       }
       System.out.println("Decimal to hexadecimal: " + str2);
   }
}
OUTPUT:
Enter a decimal number : 51966
Decimal to hexadecimal: CAFE

import java.util.Scanner;

/**
* @author Srinivas Palli
*
*/
public class SmallestBiggest {
   /**
   * @param args
   */

   public static void main(String[] args) {
       int small = 0;
       int large = 0;
       int num;

       System.out.print("enter the n value:");

       Scanner input = new Scanner(System.in);

       int n = input.nextInt();

       for (int i = 0; i < n; i++) {
           num = input.nextInt();
           // gives the largest number in n numbers
           if (num > large) {
               large = num;
           }

           // gives the smallest number in n numbers
           if (i == 0 && num > 0)
               small = num;
           if (num < small)
               small = num;

       }

       System.out.println("Largest number is " + large);
       System.out.println("Smallest number is " + small);

   }
}

OUTPUT:
enter the n value:10
7
21
5
12
14
2
1
34
9
6
Largest number is 34
Smallest number is 1

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