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Java program to Sum of natural numbers 1 to n| in 5 ways
In this tutorial, we will discuss the Java program to the sum of Natural number from 1 to n
In this post, we are going to learn how to find the sum of natural numbers in Java language in different 5 ways
Program 1
Program to Find sum of natural numbers – using for loop
import java.util.Scanner;
class Sum_Naturalfor{
public static void main(String args[]){
int sum=0,num;
Scanner scan=new Scanner(System.in);
//create a scanner object for input
System.out.print("Enter the integer number: ");
num=scan.nextInt();//get input from the user for num1
for(int i=1; i<=num; i++){
sum+=i; //sum=sum+i;
}
System.out.print("Sum of natural numbers: "+sum);
}
}
When the above code is executed it produces the following output
Enter the integer number: 12 Sum of natural numbers :78
This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using for loop in Java language
Program 2
Program to find sum of natural numbers – using the while loop
import java.util.Scanner;
class Sum_Naturalwhile{
public static void main(String args[]){
int sum=0,num;
Scanner scan=new Scanner(System.in);
//create a scanner object for input
System.out.print("Enter the integer number: ");
num=scan.nextInt();//get input from the user for num1
int i=1;
while( i<=num){
sum+=i; //sum=sum+i;
i++;
}
System.out.print("Sum of natural numbers: "+sum);
}
}
When the above code is executed it produces the following output
Enter the integer number: 25 Sum of natural numbers: 325
This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using while loop in Java language
Program 3
Program to find sum of natural numbers – using the do-while loop
import java.util.Scanner;
class Sum_NaturalDowhile{
public static void main(String args[]){
int sum=0,num;
Scanner scan=new Scanner(System.in);
//create a scanner object for input
System.out.print("Enter the integer number: ");
num=scan.nextInt();//get input from the user for num1
int i=1;
do{
sum+=i; //sum=sum+i;
i++;
}while( i<=num);
System.out.print("Sum of natural numbers: "+sum);
}
}
When the above code is executed it produces the following output
Enter the integer number: 50 Sum of natural numbers: 1275
This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using the do-while loop in Java language
Program 4
Program to find sum and average of natural numbers – using the method
import java.util.Scanner;
class Sum_Naturalmethod{
public static void main(String args[]){
int sum=0,num;
Scanner scan=new Scanner(System.in);
//create a scanner object for input
System.out.print("Enter the integer number: ");
num=scan.nextInt();//get input from the user for num1
sum=sumofNaturalNum(num);
System.out.println("The sum of Natural number fron 1 to "+num+": "+sum);
}
public static int sumofNaturalNum(int n){
if(n==0)
{
return n;
}
else{
return(n*(n+1)/2);
}
}
}
When the above code is executed it produces the following output
Enter the integer number: 15 The sum of Natural number from 1 to 15: 120
This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using the method in Java language
Program 5
Program to find sum and average of natural numbers – using the recursive method
import java.util.Scanner;
class Sum_Naturalrecmethod{
public static void main(String args[]){
int sum=0,num;
Scanner scan=new Scanner(System.in);
//create a scanner object for input
System.out.print("Enter the integer number: ");
num=scan.nextInt();//get input from the user for num1
sum=sumofNaturalNum(num);
System.out.println("The sum of Natural number fron 1 to "+num+": "+sum);
}
public static int sumofNaturalNum(int n){
if(n==0)
{
return n;
}
else{
return(n+sumofNaturalNum(n-1));
}
}
}
When the above code is executed it produces the following output
Enter the integer number: 30 The sum of Natural number from 1 to 30: 465
This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to the given number using the recursive method
Suggested for you
do-while loop in Java language
recursion in Java language
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