Practice problems

Every character, like letters, numbers, or special symbols, has a unique number assigned to it, called the ASCII value. When you input a character, we can figure out if it's a letter, number, or special character based on its ASCII value.

Here are the ranges:

For big letters (A to Z): ASCII values are between 65 and 90.
For small letters (a to z): ASCII values are between 97 and 122.
For numbers (0 to 9): ASCII values are between 48 and 57.

So, by checking the ASCII value, we can tell what kind of character you entered!

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        System.out.println("Enter any input:");
        Scanner sc = new Scanner(System.in);
        char input = sc.next().charAt(0);
 
        // check small and capital letters.
        if (input >= 48 && input <= 57) 
            System.out.println("Digit ");  
  
        // Check digit
        else if ((input >= 65 && input <= 90) 
            || (input >= 97 && input <= 122)) 
            System.out.println("Alphabet "); 
  
        // Else Special character
        else
            System.out.println("Special Character "); 
    }
}

import java.util.Scanner;
class Main
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.println("Enter the Amount :");
		int total_amount = input.nextInt();
		int cnt_500, cnt_100, cnt_50, cnt_20, cnt_10, cnt_5, cnt_2, cnt_1;
		cnt_500 = cnt_100 = cnt_50 = cnt_20 = cnt_10 = cnt_5 = cnt_2 = cnt_1 = 0;
		if(total_amount >= 500)
			cnt_500 = total_amount/500;
			total_amount -= cnt_500 * 500;
		if(total_amount >= 100)
			cnt_100 = total_amount/100;
			total_amount -= cnt_100 * 100;
		if(total_amount >= 50)
			cnt_50 = total_amount/50;
			total_amount -= cnt_50 * 50;
		if(total_amount >= 20)
			cnt_20 = total_amount/20;
			total_amount -= cnt_20 * 20;
		if(total_amount >= 10)
			cnt_10 = total_amount/10;
			total_amount -= cnt_10 * 10;
		if(total_amount >= 5)
			cnt_5 = total_amount/5;
			total_amount -= cnt_5 * 5;
		if(total_amount >= 2)
			cnt_2 = total_amount /2;
			total_amount -= cnt_2 * 2;
		if(total_amount >= 1)
			cnt_1 = total_amount;
 
		System.out.println("Total number of Notes");
		System.out.println("500 = "+ cnt_500);
		System.out.println("100 = "+ cnt_100);
		System.out.println("50 = "+ cnt_50);
		System.out.println("20 = "+ cnt_20);
		System.out.println("10 = "+ cnt_10);
		System.out.println("5 = "+ cnt_5);
		System.out.println("2 = "+ cnt_2);
		System.out.println("1 = "+ cnt_1);
	}
}

import java.util.*;
class Main {
    public static void main(String[] args) {
		System.out.print("Enter the number : ");
        Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();	
		
		for(int i = n; i >= 1; i--)
		{
			System.out.print(i +" "); 
		}	
    }
}

import java.util.*;
class Main {
    public static void main(String[] args) {
		System.out.print("Enter the number : ");
        Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();	
		
		int i = n;
		while(i >= 1)
		{
			System.out.print(i +" "); 
			i--;
		}		
    }
}

class Main {
    public static void main(String[] args) {
        // Print the letters
        System.out.println("Alphabets from a to z are:");
 
        // Using for loop to traverse each character.
        for (char i = 'a'; i <= 'z'; i++) {
            // Print the alphabet
            System.out.printf("%c ", i);
        }
    }
}

import java.util.*;
class Main {
    public static void main(String[] args) {

      System.out.println("Enter the number : ");
      Scanner sc = new Scanner(System.in);
	  int n = sc.nextInt();	
        
      int sum = 0;
      for(int i=2; i<=n; i+=2){  
         sum += i;  
      }   
       
       System.out.println("Total sum of even numbers: " + sum);  
    }
}