# Some Java Problems to practice(part 20)

I’ve included a list of some of the Java programs below. You may also view all of the Java programs on our mobile app. I strongly advise you to use our mobile app for a better experience.

## 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);
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);
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);
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);
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+ " ");

}
}

}
``````