Java Program Sum Of N Numbers | 4 Simple Ways

in Java Programs April 16, 2025 Comments Off on Java Program Sum Of N Numbers | 4 Simple Ways

Java program to calculate the sum of N numbers using arrays, recursion, static method, using while loop. Here is the complete Java program with sample outputs. You can learn more tutorials here and Java interview questions for beginners. With the following program, you can even print the sum of two numbers or three numbers up to N numbers.

How to calculate?

Just summing of two numbers or three numbers or up to N numbers.

Sum Of N Numbers Program

1. Using Arrays

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Here is the sample program with output sum of two numbers program or three numbers. check it out

How this program works: we are using arrays to store the values first. From a user input point of view, let’s assume you need to sum five numbers. Say 5: Now the next step is to enter those numbers in a series order. Once it was done, the program automatically adds all your two numbers or three numbers like up to N numbers.

check out the sample output so that you will get an Idea:

import java.util.Scanner;
class sum
{
	public static void main(String arg[])	
	{
                  int n,sum=0;
                  
                  Scanner sc=new Scanner(System.in);

	    System.out.println("enter how many numbers you want sum");
                   n=sc.nextInt();
                   int a[]=new int[n]; 
	    System.out.println("enter the "+n+" numbers ");
                   for(int i=0;i<n;i++)
                   {      
	             System.out.println("enter  number  "+(i+1)+":");
                           a[i]=sc.nextInt();
                   }
                   for(int i=0;i<n;i++)
                   {
                           sum+=a[i];
                   }  	    
                   System.out.println("sum of "+n+" numbers is ="+sum);                  
              	}
}

import java.util.Scanner;

class sum

{

public static void main(String arg[])

{

int n,sum=0;

Scanner sc=new Scanner(System.in);

System.out.println("enter how many numbers you want sum");

n=sc.nextInt();

int a[]=new int[n];

System.out.println("enter the "+n+" numbers ");

for(int i=0;i<n;i++)

{

System.out.println("enter number "+(i+1)+":");

a[i]=sc.nextInt();

}

for(int i=0;i<n;i++)

{

sum+=a[i];

}

System.out.println("sum of "+n+" numbers is ="+sum);

}

Output:

enter how many numbers you want sum
5
enter the 5 numbers
enter  number  1:
32
enter  number  2:
12
enter  number  3:
43
enter  number  4:
212
enter  number  5:
23
sum of 5 numbers is =322

enter how many numbers you want sum

enter the 5 numbers

enter number 1:

enter number 2:

enter number 3:

enter number 4:

212

enter number 5:

sum of 5 numbers is =322

2. Using Recursion

Here is another method using recursion: A recursion is a function call itself. Here is the sample program to print the sum of N numbers in Java.

import java.util.Scanner;
 class sum 
{
	public static void main(String arg[])	
	{
                  int n;
                  int s=0,a[];
                  Scanner sc=new Scanner(System.in);
	    System.out.println("Enter how many numbers you want sum");	   
                   n=sc.nextInt();
                  a=new int[n];
	    System.out.println("enter the "+n+" numbers ");
                     for(int i=0;i<n;i++)
                     {      
	             System.out.println("enter  number  "+(i+1)+":");
                            a[i]=sc.nextInt();
                      }
	      s=sum.sumofnum(a,n-1,s);	    
                    System.out.println("sum is ="+s);          
              	}
    static int sumofnum(int a[],int n,int s1)
   {
              if(n<0)
             return s1;
             else
             {
               s1+=a[n];
              
	 return sum.sumofnum(a,n-1,s1);
            }
  }

}

import java.util.Scanner;

class sum

{

public static void main(String arg[])

{

int n;

int s=0,a[];

Scanner sc=new Scanner(System.in);

System.out.println("Enter how many numbers you want sum");

n=sc.nextInt();

a=new int[n];

System.out.println("enter the "+n+" numbers ");

for(int i=0;i<n;i++)

{

System.out.println("enter number "+(i+1)+":");

a[i]=sc.nextInt();

}

s=sum.sumofnum(a,n-1,s);

System.out.println("sum is ="+s);

}

static int sumofnum(int a[],int n,int s1)

{

if(n<0)

return s1;

else

{

s1+=a[n];

return sum.sumofnum(a,n-1,s1);

}

Output:

Enter how many numbers you want sum
4
enter the 4 numbers
enter  number  1:
100
enter  number  2:
200
enter  number  3:
300
enter  number  4:
400
sum is =1000

Enter how many numbers you want sum

enter the 4 numbers

enter number 1:

100

enter number 2:

200

enter number 3:

300

enter number 4:

400

sum is =1000

3. Using Static Method

Another example program using the static method

import java.util.Scanner;
 class sum 
{
            
	public static void main(String arg[])	
	{
                  int n;
                  int s=0,a[];                  
                  Scanner sc=new Scanner(System.in);
	   System.out.println("enter how many numbers you want sum");	 
                  n=sc.nextInt();
                  a=new int[n]; 
	   System.out.println("enter the "+n+" numbers ");
                  for(int i=0;i<n;i++)
                  {      
	             System.out.println("enter  number  "+(i+1)+":");
                            a[i]=sc.nextInt();
                  }
	   s=sum.sumofnum(a,n);	    
                  System.out.println("sum is ="+s);                 
              	}
    static int sumofnum(int a[],int n)
   {       int s1=0;
             for(int i=0;i<n;i++)
                     {        
                            s1+=a[i];
                           
                      }
              return s1;
  }
}

import java.util.Scanner;

class sum

{

public static void main(String arg[])

{

int n;

int s=0,a[];

Scanner sc=new Scanner(System.in);

System.out.println("enter how many numbers you want sum");

n=sc.nextInt();

a=new int[n];

System.out.println("enter the "+n+" numbers ");

for(int i=0;i<n;i++)

{

System.out.println("enter number "+(i+1)+":");

a[i]=sc.nextInt();

}

s=sum.sumofnum(a,n);

System.out.println("sum is ="+s);

}

static int sumofnum(int a[],int n)

{ int s1=0;

for(int i=0;i<n;i++)

{

s1+=a[i];

}

return s1;

}

Output:

enter how many numbers you want sum
4
enter the 4 numbers
enter  number  1:
12345
enter  number  2:
02468
enter  number  3:
13579
enter  number  4:
235711
sum is =264103

enter how many numbers you want sum

enter the 4 numbers

enter number 1:

12345

enter number 2:

02468

enter number 3:

13579

enter number 4:

235711

sum is =264103

4. Calculate Sum Of N Numbers Using While Loop

While Loop: The Loop is used to execute a set of statements as long as the condition is true.

import java.util.Scanner;
class sum
{
	public static void main(String arg[])	
	{
                  int n,sum=0,i=0;                
                  Scanner sc=new Scanner(System.in);
	   System.out.println("Enter how many numbers you want sum");
                  n=sc.nextInt();
                  int a[]=new int[n]; 
	   System.out.println("Enter the "+n+" numbers ");
                  while(i<n)
                   {      
	       System.out.println("Enter  number  "+(i+1)+":");
                      a[i]=sc.nextInt();
	       sum+=a[i];    
	       i++;     
                    }
                 System.out.println("sum is ="+sum);                  
              	}
}

import java.util.Scanner;

class sum

{

public static void main(String arg[])

{

int n,sum=0,i=0;

Scanner sc=new Scanner(System.in);

System.out.println("Enter how many numbers you want sum");

n=sc.nextInt();

int a[]=new int[n];

System.out.println("Enter the "+n+" numbers ");

while(i<n)

{

System.out.println("Enter number "+(i+1)+":");

a[i]=sc.nextInt();

sum+=a[i];

i++;

}

System.out.println("sum is ="+sum);

}

Output:

Enter how many numbers you want sum
4
Enter the 4 numbers
Enter  number  1:
12
Enter  number  2:
12
Enter  number  3:
13
Enter  number  4:
13
sum is =50

Enter how many numbers you want sum

Enter the 4 numbers

Enter number 1:

Enter number 2:

Enter number 3:

Enter number 4:

sum is =50

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Java Program Sum Of N Numbers | 4 Simple Ways

Sum Of N Numbers Program

2. Using Recursion

4. Calculate Sum Of N Numbers Using While Loop

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