Some Java Problems to practice(part 20)

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196. Write a program in java using to print the sum of first ten positive integers.

 class PositiveNumber {  
   public static void main(String[] args) {  
   int sum = 0;  
   for (int i = 1; i   <= 10; i++) {  
   sum = sum + i;  
   }  
   System.out.println("The sum of first ten positive integers is " + sum);  
   }  
   }

197. Write a program in java to print cube root of an ask number.

import java.util.Scanner;  
     
   class CubeRoot {  
   public static void main(String[] args) {  
   Scanner sc = new Scanner(System.in);  
   System.out.println("Enter your number");  
   int num = sc.nextInt();  
   int cube = (int) Math.pow(num, 1 / 3);  
   System.out.println("The cube root of " + num + " is " + cube);  
   }  
   }

198. Write a program in java to convert octal number to decimal number.

import java.util.Scanner;  
     
   class OctalToDecimal {  
   public static void main(String[] args) {  
   Scanner sc = new Scanner(System.in);  
   System.out.println("Enter your octal number");  
   int oct = sc.nextInt();  
   int dec = 0;  
   int i = 0;  
   while (oct != 0) {  
   int rem = oct % 10;  
   dec = dec + rem * (int) Math.pow(8, i);  
   i++;  
   oct = oct / 10;  
   }  
   System.out.println("The decimal number is " + dec);  
   }  
   }

199. Write a program in java to ask number and check whether the given no is prime or not

import java.util.Scanner;  
     
   class Prime {  
   public static void main(String[] args) {  
   Scanner sc = new Scanner(System.in);  
   System.out.println("Enter your number");  
   int num = sc.nextInt();  
   int flag = 0;  
   for (int i = 2; i   <= num / 2; i++) {  
   if (num % i == 0) {  
   flag = 1;  
   break;  
   }  
   }  
   if (flag == 0) {  
   System.out.println("The number is prime");  
   } else {  
   System.out.println("The number is not prime");  
   }  
   }  
   }

200.Write a program in java to generate the series 1,2,4,8,16… upto 10th term.

class Series  
{  
   public static void main(String args[]){  
   int a = 1;  
       for (int i = 1; i   < 10; i++) {  
           System.out.print(a+ " ");  
           a=a*2;  
  
       }  
   }  
  
}

201. Write a program in java to convert decimal number to binary number.

 import java.util.Scanner;  
     
   class DecimalToBinary {  
   public static void main(String[] args) {  
   Scanner sc = new Scanner(System.in);  
   System.out.println("Enter your decimal number");  
   int dec = sc.nextInt();  
   int bin = 0;  
   int i = 0;  
   while (dec != 0) {  
   int rem = dec % 2;  
   bin = bin + rem * (int) Math.pow(10, i);  
   i++;  
   dec = dec / 2;  
   }  
   System.out.println("The binary number is " + bin);  
   }  
   }

202. Write a program in java to generate the series 50,46,41,35…………7th terms.

class Series  
{  
   public static void main(String args[]){  
   int a = 50;  
   int b=4;  
  
       for (int i = 1; i   <= 7; i++) {  
           System.out.print(a+ " ");  
           a=a-b;  
           b=b+1;  
  
       }  
   }  
  
}

203. Write a program in java to generate the series 1,4,7,10…………12th terms.

class Series  
{  
   public static void main(String args[]){  
   int a = 1;  
       for (int i = 1; i   <= 12; i++) {  
           System.out.print(a+ " ");  
           a=a+3;  
       }  
   }  
  
}

204. Write a program in java to print all palindrome numbers from 1 to 200.

 import java.util.Scanner;  
     
   class Palindrome {  
   public static void main(String[] args) {  
   for (int i = 1; i   <= 200; i++) {  
   String str = String.valueOf(i);  
   String rev = "";  
   for (int j = str.length() - 1; j >= 0; j--) {  
   rev = rev + str.charAt(j);  
   }  
   if (str.equals(rev)) {  
   System.out.println(str);  
   }  
   }  
   }  
   }

205. Write a program in java to print all natural numbers from 1 to 100.

class Series  
{  
   public static void main(String args[]){  
       for (int i = 1; i   <= 100; i++) {  
           System.out.print(i+ " ");  
  
       }  
   }  
  
}