Skip to content

first-java.md

Latest commit

 

History

History
289 lines (190 loc) · 5.91 KB

first-java.md

File metadata and controls

289 lines (190 loc) · 5.91 KB
Raw
  1. Write a program to print whether a number is even or odd, also take input from the user.

import java.util.Scanner;

public class EvenOdd {

public static void main(String[] args) {

    Scanner reader = new Scanner(System.in);

    System.out.print("Enter a number: ");
    int num = reader.nextInt();

    if(num % 2 == 0)
        System.out.println(num + " is even");
    else
        System.out.println(num + " is odd");
}

}

  1. Take name as input and print a greeting message for that particular name.

import java.util.Scanner;

public class Basic3 {

public static void main(String[] args) {

	System.out.println("Please enter your name:");

	Scanner input = new Scanner(System.in);
	String name = input.next();

	System.out.println("Hello " + name);

}

}

  1. Write a program to input principal, time, and rate (P, T, R) from the user and find Simple Interest

import java.util.Scanner;

public class KboatCompoundInterest { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.print("Enter Principal: "); double p = in.nextDouble(); System.out.print("Enter Rate: "); double r = in.nextDouble(); System.out.print("Enter Time: "); int t = in.nextInt(); double amt = p; for (int i = 1; i <= t; i++) { double interest = (amt * r * 1) / 100.0; amt += interest; System.out.println("Amount after " + i + " year = " + amt); } } }

  1. Take in two numbers and an operator (+, -, *, /) and calculate the value. (Use if conditions)

import java.util.Scanner;

class Main { public static void main(String[] args) {

char operator;
Double number1, number2, result;

// create an object of Scanner class
Scanner input = new Scanner(System.in);

// ask users to enter operator
System.out.println("Choose an operator: +, -, *, or /");
operator = input.next().charAt(0);

// ask users to enter numbers
System.out.println("Enter first number");
number1 = input.nextDouble();

System.out.println("Enter second number");
number2 = input.nextDouble();

switch (operator) {

  // performs addition between numbers
  case '+':
    result = number1 + number2;
    System.out.println(number1 + " + " + number2 + " = " + result);
    break;

  // performs subtraction between numbers
  case '-':
    result = number1 - number2;
    System.out.println(number1 + " - " + number2 + " = " + result);
    break;

  // performs multiplication between numbers
  case '*':
    result = number1 * number2;
    System.out.println(number1 + " * " + number2 + " = " + result);
    break;

  // performs division between numbers
  case '/':
    result = number1 / number2;
    System.out.println(number1 + " / " + number2 + " = " + result);
    break;

  default:
    System.out.println("Invalid operator!");
    break;
}

input.close();

} }

  1. Take 2 numbers as input and print the largest number.

import java.util.Scanner;

public class LargestofTwo { private static Scanner sc; public static void main(String[] args) { int number1, number2; sc = new Scanner(System.in);

	System.out.print(" Please Enter the First Number : ");
	number1 = sc.nextInt();	
	
	System.out.print(" Please Enter the Second Number : ");
	number2 = sc.nextInt();	
	
	if(number1 > number2) 
    {
		System.out.println("\n The Largest Number = " + number1);          
    } 
    else if (number2 > number1)
    { 
    	System.out.println("\n The Largest Number = " + number2);        
    } 
    else 
    {
    	System.out.println("\n Both are Equal");
    }		
}
  1. Input currency in rupees and output in USD.

import java.util.Scanner;

public class MathUnitConversions17 {

public static void main(String[] args) {

	float rupees;

	Scanner in = new Scanner(System.in);

	System.out.println("Please enter rupees:");

	rupees = in.nextLong();

	float dollars = rupees / 75 ;

	System.out.println(dollars + " Dollars");
}

}

7)To calculate Fibonacci Series up to n numbers.

import java.util.*;

class fiboN { public static void main(String args[]) { int i,c=0,n; Scanner sc = new Scanner(System.in); System.out.println("Enter a number to generate fibonacci series upto nth term"); n=sc.nextInt(); int a=0; int b=1;

System.out.println("Fibonacci series upto "+n+" is :-"); while(c<=n) { System.out.print(c+" "); a=b; b=c; c=a+b; } } }

8)To find out whether the given String is Palindrome or not.

import java.util.Scanner;

class ChkPalindrome { public static void main(String args[]) { String str, rev = ""; Scanner sc = new Scanner(System.in);

  System.out.println("Enter a string:");
  str = sc.nextLine();

  int length = str.length();

  for ( int i = length - 1; i >= 0; i-- )
     rev = rev + str.charAt(i);

  if (str.equals(rev))
     System.out.println(str+" is a palindrome");
  else
     System.out.println(str+" is not a palindrome");

} }

9)To find Armstrong Number between two given number.

import java.util.Scanner; public class ArmstrongBetweenTwoNumbers { public static void main(String args[]){ int num1, num2; Scanner sc = new Scanner(System.in); System.out.println("Enter the first number ::"); num1 = sc.nextInt(); System.out.println("Enter the second number ::"); num2 = sc.nextInt();

  for (int i = num1; i<num2; i++){
     int check, rem, sum = 0;
     check = i;
     while(check != 0) {
        rem = check % 10;
        sum = sum + (rem * rem * rem);
        check = check / 10;
     }
     if(sum == i){
        System.out.println(""+i+" is an Armstrong number.");
     }
  }

} }