NEED A JAVA PROGRAM WITHOUT USING SCANNER FOR THE FOLLOWING

 NEED A JAVA PROGRAM WITHOUT USING SCANNER FOR THE FOLLOWING List of programming questions  1) If m and n are integers, then sum(m,n) is the sum of all integers in the interval [m,n), which is 0 if the interval is empty. public static int sum(int m, int n){ /*...*/ }  2) If m and n are integers, then product(m,n) is the product of all integers in the interval [m,n), which is 1 if the interval is empty. public static int product(int m, int n){ /*...*/ }  3) If m and n are integers, countEvens(m,n) is the number of even integers which are greater than m and less than n. public static int countEvens(int m, int n){ /*...*/ }  4) If m is an integer, sumUpTo(m) is the sum of the integers in [0,m). public static int sumUpTo(int m){ /*...*/ }  5) If m is an integer, digits(m) is the number of decimal digits in the shortest decimal expansion of m. For example, digits(493) is 3, digits(0) is 1, and digits(-33) is 2. public static int digits(int m){ /*...*/ } 

Solution

Solving the first four cases :

/* package whatever; // don\'t place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be \"Main\" only if the class is public. */
class Ideone
{
   public static int sum(int m, int n)
   {
       int sum=0;
       int min=m<n?m:n;
       int max=m>n?m:n;
       for(int i=min;i<max;i++)
       sum+=i;
       if(sum==0)
       sum=1;
       return sum;
   }
   public static int product(int m, int n)
   {
       int product=1;
       int min=m<n?m:n;
       int max=m>n?m:n;
       for(int i=min;i<max;i++)
       product*=i;
      
       return product;
   }
  
   public static int countEven(int m, int n)
   {
       int count=0;
       int min=m<n?m:n;
       int max=m>n?m:n;
       for(int i=min+1;i<max;i++)
       {
           if(i%2==0)
           count++;
       }
      
       return count;
   }
   public static int sumUpTo(int m)
   {
       int sum=0;
      
       for(int i=0;i<m;i++)
       sum+=i;
      
       return sum;
      
   }

   public static void main (String[] args) throws java.lang.Exception
   {
       // Smaple Input.
       System.out.println(sum(4,6));
       System.out.println(product(4,6));
       System.out.println(countEven(3,9));
       System.out.println(sumUpTo(3));
   }
}