Programs for beginners class IX

import java.util.*;
class MathFunctions
{ 
    public static void main()
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number");
        int n=sc.nextInt();
        switch(n)
        {
            case 1:
            System.out.println("Enter two numbers");
            int a=sc.nextInt(); int b=sc.nextInt();
            System.out.println("The biggest nmber is"+Math.max(a,b));
            break;
            case 2:
            System.out.println("Enter a number");
            int c=sc.nextInt(); 
            System.out.println("The absolute values is"+Math.abs(c)); 
            break;
            case 3:
            System.out.println("Enter a number");
            int d=sc.nextInt(); 
            System.out.println("The SQRT is"+Math.sqrt(d)); break;
            case 4:
            System.out.println("The random number is"+Math.random()); 
            break;
            default:
            System.out.println("Enter a number between 1 to 4");
            break;           
        }
    }
}

import java.util.*;
class Series
{ 
    public static void main()
    {
      int sum=0;   
      for(int i=1;i<=10;i++)
        {
            int q=i*i;
            sum=sum+q;
        }
        System.out.println("The sum of the series1 is+sum);
        
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number");
        int n=sc.nextInt();
         float sum1=0.0f;
        for(int i=2;i<=n;i+=2)
        {
            sum1=sum1+i;
        }
        System.out.println("The sum of the series2 is "+sum1);
          
    }
}

class Series
{ 
    public static void main()
    {
        for(int i=1;i<=9;i+=2)
        {
            System.out.print(i + " ");
        }
          System.out.println();
          
        for(int i=30;i>=10;i-=5)
        {
              System.out.print(i+ " ");   
        }
      
    }
}

/*A computer salesman gets commission on the following basis:              
Sales               
  Commission Rate
  Rs. 0 - 20,000  
  3%
Rs. 20,000 - 50,000       
  12%
  Rs. 50,001 and more      
  31%

Write a program to  accept the sales as input, calculate and print his commission amount and rate of commission.        
*/
import java.util.*;
class Commision
{
    public static void main()
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the sales amount");
        int saleAmt=sc.nextInt();
        int comRate=0;
        float commision=0.0f;
        if(saleAmt>0 && saleAmt<20000)
        comRate=3;
        else if(saleAmt >= 20000 && saleAmt < 50000)
        comRate=12;
        else
        comRate=31;
        
        commision=(comRate*saleAmt)/100;
        
        System.out.println("The sales amount is "+saleAmt);
        System.out.println("The commision rate is "+comRate);
        System.out.println("The commision is "+commision);
        
    }
}