Check Prime Optimized Function Code Java Programming

Optimized Function: Check if a number is Prime or not Java code: 🧊

public class CheckPrimeOptimized {

    public static boolean isPrime(int n) {

        if (n == 2) {

            return true;

        }

        for (int i = 2; i <= Math.sqrt(n); i++) {

            if (n % i == 0) {

                return false;

            }

        }

        return true;

    }

    public static void main(String[] args) {

        System.out.println(isPrime(6833));

        System.out.println(isPrime(6834));

    }

}

java .\CheckPrimeOptimized.java

true

false

Call by value Example using java programming code

Call by value Example using java programming code 

public class CallByValue {

    public static void swap(int a, int b) {

        // Swap

        int temp = b;

        b = a;

        a = 35;

    }

    public static void main(String[] args) {

        // swap - value exchange

        int a = 45;

        int b = 25;

        swap(a, b);

        System.out.println("a is : " + a);

        System.out.println("b is : " + b);

    }

}

Product of a and b simple java programming code

Product of a and b 

public class FindProductAB {

    public static int multiply(int a, int b) {

        int product = a * b;

        return product;

    }

    public static void main(String[] args) {

        int Nov = 25;

        int Dec = 4;

        // int prod = multiply(3, 5);

        int prod = multiply(Nov, Dec);

        System.out.println(Nov + " * " + Dec + " = " + prod);

        prod = multiply(3, 5);

        System.out.println(prod);

    }

}

Simple Factorial Function using JAVA programming code

Factorial Function

public class FacrorialOfNumberN {

    public static int factorial(int n) {

        int f = 1;

        for (int i = 1; i <= n; i++) {

            f = f * i;

        }

        return f; // factorial of n.

    }

    public static void main(String[] args) {

        // int number = 9;

        // int fac = factorial(number);

        // System.out.println(fac);

        System.out.println(factorial(4));

    }

}

I love u bby 🤭

V.1 Find Binomial Coefficient using Factorial Function Java Programming Code

easy method Find Binomial Coefficient using Factorial Function Java Programming Code

public class BinomialCoefficient {

    public static int factorial(int n) {

        int f = 1;

        for (int i = 1; i <= n; i++) {

            f = f * i;

        }

        return f; // factorial of n.

    }

    public static void main(String[] args) {

        int n = 5, r = 2;

        int nmr = n - r;

        int factN = factorial(n);

        int factR = factorial(r);

        int factNMR = factorial(nmr);

        int BinCo = factN / (factR * factNMR);

        System.out.println(BinCo);

    }

}

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V.2 Find Binomial Coefficient using Factorial Function Java Programming Code

Find Binomial Coefficient using Factorial Function Java Programming Code

public class BinCoeff {

    public static int factorial(int n) {

        int f = 1;

        for (int i = 1; i <= n; i++) {

            f = f * i;

        }

        return f; // factorial of n.

    }

    public static int BinCoeff(int n, int r) {

        int fact_n = factorial(n);

        int fact_r = factorial(r);

        int fact_nmr = factorial(n - r);

        int BinCoeff = fact_n / (fact_r * fact_nmr);

        return BinCoeff;

    }

    public static void main(String[] args) {

        System.out.println(BinCoeff(5, 2));

    }

}

🤭

Function Overloading using Parameters, Java Programming Code

Function Overloading using Parameters, Java Programming Code

public class functionOverLoading {

    // func to calc sum of 2 nums

    public static int sum(int a, int b) {

        return a + b;

    }

    // func to calc sum of 3 nums

    public static int sum(int a, int b, int c) {

        return a + b + c;

    }

    public static void main(String[] args) {

        System.out.println(sum(5, 6));

        System.out.println(sum(5, 7, 12));

    }

}

Function Overloading using Data Types, Java programming Code

Data Types: Function Overloading using Data Types

public class functionOverLoadingDataTypes {

    // func to cal int sum

    public static int sum(int a, int b) {

        return a + b;

    }

    // func to cal float sum

    public static float sum(Float a, Float b) {

        return a + b;

    }

    public static void main(String[] args) {

        System.out.println(sum(10, 15));

        System.out.println(sum(10.5f, 15.57f));

    }

}

Function: Check if a number is Prime or not Java programming code

Check if a number is Prime or not Function Code:

public class PrimeNumF1 {

    public static boolean isPrime(int n) {

        // corner cases

        // 2

        if (n == 2) {

            return true;

        }

        // boolean isPrime = true;

        for (int i = 2; i <= n - 1; i++) {

            if (n % i == 0) { // Completely dividing

                // isPrime = false;

                // We any use any technic in comment options.

                // break;

                // return isPrime;

                return false;

            }

        }

        // return isPrime;

        return true;

    }

    public static void main(String[] args) {

        System.out.println(isPrime(7907));

    }

}

java .\PrimeNumF1.java

true

NUMBER PYRAMID Pattern simple Java Programming code

 Output of Code:

java .\NumberPyramid.java

     1

    2 2

   3 3 3

  4 4 4 4

 5 5 5 5 5

6 6 6 6 6 6

Java Code:

public class NumberPyramid {

    public static void main(String[] args) {

        int n = 6;

        // char ch = 'A';

        for (int i = 1; i <= n; i++) {

            for (int j = 1; j <= n - i; j++) {

                System.out.print(" ");

            }

            for (int j = 1; j <= i; j++) {

                System.out.print(i + " ");

            }

            System.out.println(" ");

        }

    }

}

Print Half Pyramid Character Pattern Java Programming Code

  Output:

Simple Java Code:

public class printCharacterPatternHalfPyramid {

    public static void main(String[] args) {

        int n = 7;

        char ch = 'A';

        for (int i = 1; i <= n; i++) {

            // number print

            for (int num = 1; num <= i; num++) {

                System.out.print(ch);

                ch++;

            }

            System.out.println();

        }

    }

}

...

java .\printCharacterPatternHalfPyramid.java

A

BC

DEF

GHIJ

KLMNO

PQRSTU

Half Pyramid Pattern Simple Java Programming Code

 This is Half Pyramid image, but in programming: this code is not fixed name, it's used to just define this code.

Half Pyramid Pattern Java Code:

public class HalfPyramid {

    public static void main(String[] args) {

        int n = 11;

        for (int i = 1; i <= n; i++) {

            // number print

            for (int num = 1; num <= i; num++) {

                System.out.print(num);

            }

            System.out.println();

        }

    }

}

Output: 

java .\HalfPyramid.java

1

12

123

1234

12345

123456

1234567

12345678

123456789

12345678910

1234567891011

Inverted Stars Pattern Java Programming Code (Using Nested Loop)

Using Nested Loop Inverted Star Pattern

import java.util.Scanner;

public class InvertedStarPattern {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for (int line = 1; line <= n; line++) {

            // one line

            for (int star = 1; star <= n - line + 1; star++) {

                System.out.print("*");

            }

            System.out.println("");

        }

    }

}

Output: 

7

*******

******

*****

****

***

**

*

Nested Loops Star Pattern Java Programming java code

Simple Java Code for Star Pattern.

import java.util.Scanner;

public class StarPatternUsingNastedLoops {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int i = sc.nextInt();

        for (int line = 1; line <= i; line++) {

            // one line

            for (int star = 1; star <= line; star++) {

                System.out.print("*");

            }

            System.out.println("");

        }

    }

}

Output: 

java .\StarPatternUsingNastedLoops.java

7

*

**

***

****

*****

******

*******

Java program to print the multiplication table of a number N, entered by the user.

filename = MultiplicationTable.java

//Write a program to print the multiplication table of a number N, entered by the user.

import java.util.*;

class MultiplicationTable {

    public static void printMultiplicationTable(int number) {

        Scanner sc = new Scanner(System.in);

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

        int n = sc.nextInt();

        for (int i = 1; i <= 10; i++) {

            System.out.println(n + " * " + i + " = " + n * i);

        }

    }

    public static void main(String s[]) {

        printMultiplicationTable(5);

    }

}

filename: MultiTest.java

import java.util.*; //Write a program to print the multiplication table of a number N, entered by the user.

public class MultiTest {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

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

        int n = sc.nextInt();

        for (int i = 1; i <= 10; i++) {

            System.out.println(n + " * " + i + " = " + n * i);

        }

    }

}

filename: printMultiplicationTable.java

import java.util.*; //Write a program to print the multiplication table of a number N, entered by the user.

class MultiplicationTable {

    public static void printMultiplicationTable(int number) {

        Scanner sc = new Scanner(System.in);

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

        int n = sc.nextInt();

        for (int i = 1; i <= 10; i++) {

            System.out.println(n + " * " + i + " = " + n * i);

        }

    }

    public static void main(String s[]) {

        printMultiplicationTable(5);

    }

}

Output of program: 

Loops> java .\MultiplicationTable.java

Enter number: 5

5 * 1 = 5

5 * 2 = 10

5 * 3 = 15

5 * 4 = 20

5 * 5 = 25

5 * 6 = 30

5 * 7 = 35

5 * 8 = 40

5 * 9 = 45

5 * 10 = 50

Write a JAVA program that reads a set of integers, and then prints the sum of the even and odd integers.

 import java.util.Scanner;

public class ReadSetofIntegersPrintsSumofEvenAndOddIntegers {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int number, chioce, evenSum = 0, OddSum = 0;

        do {

            System.out.print("Enter the number ");

            number = sc.nextInt();

            if (number % 2 == 0) {

                evenSum += number;

            } else {

                OddSum += number;

            }

            System.out.println("Do you want to continue? Press 1 for yes or 0 for no");

            chioce = sc.nextInt();

        } while (chioce == 1);

        System.out.println("Sum of even numbers: " + evenSum);

        System.out.println("Sum of odd numbers: " + OddSum);

    }

}

import java.util.Scanner;

public class ReadSetofIntegersPrintsSumofEvenAndOddIntegers {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int number, chioce, evenSum = 0, OddSum = 0;

        do {

            System.out.print("Enter the number ");

            number = sc.nextInt();

            if (number % 2 == 0) {

                evenSum += number;

            } else {

                OddSum += number;

            }

            System.out.println("Do you want to continue? Press 1 for yes or 0 for no");

            chioce = sc.nextInt();

        } while (chioce == 1);

        System.out.println("Sum of even numbers: " + evenSum);

        System.out.println("Sum of odd numbers: " + OddSum);

    }

}

Output:

Enter the number 4 Do you want to continue? Press 1 for yes or 0 for no 1 Enter the number 6 Do you want to continue? Press 1 for yes or 0 for no 1 Enter the number 8 Do you want to continue? Press 1 for yes or 0 for no 1 Enter the number 9 Do you want to continue? Press 1 for yes or 0 for no 0 Sum of even numbers: 18 Sum of odd numbers: 9

Check if a number is Prime or not simple Java programming Code

 import java.util.Scanner;

public class PrimeNumberCheck {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        boolean isPrime = true;

        for (int i = 2; i <= n - 1; i++) {

            if (n % i == 0) { // n is multiple of i (i not equal to 1 or n)

                isPrime = false;

            }

        }

        if (isPrime == true) {

            System.out.print(n + " is prime number");

        } else {

            System.out.print(n + " is not prime number");

        }

    }

}

import java.util.Scanner;

public class PrimeNumberCheck {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        boolean isPrime = true;

        for (int i = 2; i <= n - 1; i++) {

            if (n % i == 0) { // n is multiple of i (i not equal to 1 or n)

                isPrime = false;

            }

        }

        if (isPrime == true) {

            System.out.print(n + " is prime number");

        } else {

            System.out.print(n + " is not prime number");

        }

    }

}

Keep entering numbers till user enters a multiple of 10, simple Java programming Code by Naymul Islam PCIU CSE 18

 import java.util.Scanner;

public class KeepEnteringNumbersTillUserEntersMultipleOf {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        do {

            System.out.println("Enter your Number : ");

            int num = sc.nextInt();

            if (num % 10 == 0) {

                break;

            }

            System.out.println(num);

        } while (true);

    }

}

import java.util.Scanner;

public class KeepEnteringNumbersTillUserEntersMultipleOf {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        do {

            System.out.println("Enter your Number : ");

            int num = sc.nextInt();

            if (num % 10 == 0) {

                break;

            }

            System.out.println(num);

        } while (true);

    }

}

Reverse the given number simple Java programming Code by Naymul Islam PCIU CSE 18

 import java.util.Scanner;

public class ReverseTheGivennNumber {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int num = sc.nextInt();

        int rev = 0;

        while (num > 0) {

            int lastDigit = num % 10;

            rev = (rev * 10) + lastDigit;

            num /= 10;

        }

        System.out.println(rev);

    }

}

import java.util.Scanner;

public class ReverseTheGivennNumber {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int num = sc.nextInt();

        int rev = 0;

        while (num > 0) {

            int lastDigit = num % 10;

            rev = (rev * 10) + lastDigit;

            num /= 10;

        }

        System.out.println(rev);

    }

}

Print reverse of a number simple Java programming Code by Naymul Islam PCIU CSE 18

 import java.util.Scanner;

public class ReverseOfNumber {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in); // use for input from user

        int num = sc.nextInt();

        // int num = 10899;

        while (num > 0) {

            int lastDigit = num % 10;

            System.out.print(lastDigit);

            num = num / 10; // n/10;

        }

        System.out.println();

    }

}

import java.util.Scanner;

public class ReverseOfNumber {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in); // use for input from user

        int num = sc.nextInt();

        // int num = 10899;

        while (num > 0) {

            int lastDigit = num % 10;

            System.out.print(lastDigit);

            num = num / 10; // n/10;

        }

        System.out.println();

    }

}

Print Square pattern Java programming Code Basic

 import java.util.*;

//Print Square pattern

public class squarePattern {

    public static void main(String args[]) {

        // for (int lines = 1; lines <= 4; lines++)

        // System.out.println("****");

        int lines = 1;

        while (lines <= 4) {

            System.out.println("****");

            lines++;

        }

    }

}

import java.util.*;

//Print Square pattern

public class squarePattern {

    public static void main(String args[]) {

        // for (int lines = 1; lines <= 4; lines++)

        // System.out.println("****");

        int lines = 1;

        while (lines <= 4) {

            System.out.println("****");

            lines++;

        }

    }

}

Sum of first N natural Numbers Java programming code

 import java.util.Scanner;

// Sum of first N natural Numbers , Naymul Islam CSE 18

public class sumofN {

    public static void main(String args[]) {

        System.out.print("Enter Natural Number: ");

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int sum = 0;

        int i = 1;

        while (i <= n) {

            sum += i;

            i++;

        }

        // System.out.println(sum);

        System.out.println("Sum of first " + n + " natural Numbers: " + sum);

    }

}

import java.util.Scanner;

// Sum of first N natural Numbers

public class sumofN {

    public static void main(String args[]) {

        System.out.print("Enter Natural Number: ");

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int sum = 0;

        int i = 1;

        while (i <= n) {

            sum += i;

            i++;

        }

        // System.out.println(sum);

        System.out.println("Sum of first " + n + " natural Numbers: " + sum);

    }

}

I Love You Print in 100 times JAVA code

 import java.util.Scanner;

public class WhileLoop {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int counter = 1;

        while (counter <= n) {

            System.out.println("I Love You " + counter);

            counter++;

        }

        System.out.println(n + " times I love you print.");

    }

}

Simple Calculator JAVA code

 import java.util.Scanner;

public class calculator {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter a :");

        int a = sc.nextInt();

        System.out.println("Enter b :");

        int b = sc.nextInt();

        System.out.println("Enter Operator");

        char operator = sc.next().charAt(0);

        switch (operator) {

            case '+':

                System.out.println(a + b);

                break;

            case '-':

                System.out.println(a - b);

                break;

            case '*':

                System.out.println(a * b);

                break;

            case '/':

                System.out.println(a / b);

                break;

            case '%':

                System.out.println(a % b);

                break;

            default:

                System.out.println("Wrong Operator");

                break;

        }

    }

}

import java.util.Scanner;

public class calculator {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter a :");

        int a = sc.nextInt();

        System.out.println("Enter b :");

        int b = sc.nextInt();

        System.out.println("Enter Operator");

        char operator = sc.next().charAt(0);

        switch (operator) {

            case '+':

                System.out.println(a + b);

                break;

            case '-':

                System.out.println(a - b);

                break;

            case '*':

                System.out.println(a * b);

                break;

            case '/':

                System.out.println(a / b);

                break;

            case '%':

                System.out.println(a % b);

                break;

            default:

                System.out.println("Wrong Operator");

                break;

        }

    }

}

"Year is a leap year or not" JAVA code by Naymul Islam CSE 18 PCIU

Code: 

import java.util.Scanner;

public class LeapYear {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Input the year: ");

        int year = sc.nextInt();

        boolean x = (year % 4) == 0;

        boolean y = (year % 100) != 0;

        boolean z = ((year % 100 == 0) && (year % 400 == 0));

        if (x && (y || z)) {

            System.out.println(year + " is a leap year");

        } else {

            System.out.println(year + " is not a leap year");

        }

    }

}

 import java.util.Scanner;

public class LeapYear {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Input the year: ");

        int year = sc.nextInt();

        boolean x = (year % 4) == 0;

        boolean y = (year % 100) != 0;

        boolean z = ((year % 100 == 0) && (year % 400 == 0));

        if (x && (y || z)) {

            System.out.println(year + " is a leap year");

        } else {

            System.out.println(year + " is not a leap year");

        }

    }

}