# Some Java Problems to practice(part 14)

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.

## 135.  Write a program in java to print all prime numbers from 1 to 100.

``````import java.util.Scanner;

public static void main(String[] args) {
for (int i = 2; i   <= 100; i++) {
int count = 0;
for (int j = 2; j   <= i; j++) {
if (i % j == 0) {
count++;
}
}
if (count == 1) {
System.out.println(i);
}
}
}

}
``````

## 136. Write a program in java to ask number and find sum of square of even digits.

``````import java.util.Scanner;

class SumOfSquareOfEvenDigit{
public static void main(String[] args) {
int num = 0;
System.out.println("Enter number");
Scanner MyScanner = new Scanner(System.in);
num = MyScanner.nextInt();
int sum = 0;
while (num != 0) {
int rem = num % 10;
if (rem % 2 == 0) {
sum = sum + (rem * rem);
}
num = num / 10;
}
System.out.println("Sum of square of even digits is " + sum);
}

}
``````

## 137. Write a program in java to ask number and find sum of square of odd digits.

``````import java.util.Scanner;

class SumOfSquareOfOddDigit{
public static void main(String[] args) {
int num = 0;
System.out.println("Enter number");
Scanner MyScanner = new Scanner(System.in);
num = MyScanner.nextInt();
int sum = 0;
while (num != 0) {
int rem = num % 10;
if (rem % 2 != 0) {
sum = sum + (rem * rem);
}
num = num / 10;
}
System.out.println("Sum of square of odd digits is " + sum);
}
}

``````

## 138. Write a program in java to ask number and find product of even digits.

``````import java.util.Scanner;

class ProductOfEvenDigit{
public static void main(String[] args) {
int num = 0;
System.out.println("Enter number");
Scanner MyScanner = new Scanner(System.in);
num = MyScanner.nextInt();
int prod = 1;
while (num != 0) {
int rem = num % 10;
if (rem % 2 == 0) {
prod = prod * rem;
}
num = num / 10;
}
System.out.println("Product of even digits is " + prod);
}
}

``````

## 139. Write a program in java TO CHECK WHETHER THE ASK NUMBER IS PERFECT SQUARE NUMBER OR NOT.

``````import java.util.Scanner;

class PerfectSquareNumber{
public static void main(String[] args) {
int num = 0;
System.out.println("Enter number");
Scanner MyScanner = new Scanner(System.in);
num = MyScanner.nextInt();
int sq = 0;
for (int i = 1; i   <= num; i++) {
if (num % i == 0) {
sq = sq + i;
}
}
if (sq == num) {
System.out.println("Number is perfect square number");
} else {
System.out.println("Number is not perfect square number");
}
}
}

``````

## 140. Write a program to input sales amount and rate of commission then calculate commission and return net sales. [ns=sa-c).

``````import java.util.Scanner;

class Sale{
public static void main(String[] args) {
double sales = 0;
double rate = 0;
double commission = 0;
double netSales = 0;
System.out.println("Enter sales amount");
Scanner MyScanner = new Scanner(System.in);
sales = MyScanner.nextDouble();
System.out.println("Enter rate of commission");
rate = MyScanner.nextDouble();
commission = sales * rate / 100;
netSales = sales - commission;
System.out.println("Commission is " + commission);
System.out.println("Net sales is " + netSales);
}
}

``````

## 141. Write a program in java to print all odd numbers from 1 to 100 also print its sum.

``````class SumOfOddNumber{
public static void main(String[] args) {
int sum = 0;
for (int i = 1; i   <= 100; i++) {
if (i % 2 != 0) {
System.out.println(i);
sum = sum + i;
}
}
System.out.println("Sum of odd numbers is " + sum);
}
}

``````

## 142. Write a program in java to enter any three strings and print the longest one.

``````import java.util.Scanner;

class LongestString{
public static void main(String[] args) {
String str1 = "";
String str2 = "";
String str3 = "";
System.out.println("Enter string 1");
Scanner MyScanner = new Scanner(System.in);
str1 = MyScanner.nextLine();
System.out.println("Enter string 2");
str2 = MyScanner.nextLine();
System.out.println("Enter string 3");
str3 = MyScanner.nextLine();
if (str1.length() > str2.length()   &;  &; str1.length() > str3.length()) {
System.out.println("Longest string is " + str1);
} else if (str2.length() > str1.length()   &;  &; str2.length() > str3.length()) {
System.out.println("Longest string is " + str2);
} else {
System.out.println("Longest string is " + str3);
}
}
}
``````

## 143. Write a program in java to print all even numbers from 2 to 100.

``````class EvenNumbers {
public static void main(String args[]) {
for (int i = 2; i   <101 ; i++) {
System.out.print(i+ " ");
i++;

}
}
}

``````

## 144. Write a program in java to ask any string and count total no. of vowels, consonants, words and sentences.

``````import java.util.Scanner;

class Count{
public static void main(String[] args) {
String str = "";
int vowels = 0;
int consonants = 0;
int words = 0;
int sentences = 0;
System.out.println("Enter string");
Scanner MyScanner = new Scanner(System.in);
str = MyScanner.nextLine();
for (int i = 0; i   < str.length(); i++) {
if (str.charAt(i) == \'a\' || str.charAt(i) == \'e\' || str.charAt(i) == \'i\' || str.charAt(i) == \'o\' || str.charAt(i) == \'u\') {
vowels = vowels + 1;
} else if (str.charAt(i) == \'A\' || str.charAt(i) == \'E\' || str.charAt(i) == \'I\' || str.charAt(i) == \'O\' || str.charAt(i) == \'U\') {
vowels = vowels + 1;
} else if (str.charAt(i) == \' \') {
words = words + 1;
} else if (str.charAt(i) == \'.\' || str.charAt(i) == \'!\' || str.charAt(i) == \'?\') {
sentences = sentences + 1;
} else {
consonants = consonants + 1;
}
}
System.out.println("No. of vowels is " + vowels);
System.out.println("No. of consonants is " + consonants);
System.out.println("No. of words is " + words);
System.out.println("No. of sentences is " + sentences);
}
}
``````