 ## Java Program to find Sum of Natural Numbers with Example

Natural numbers are the positive integers 1, 2, 3, 4, and so on. We will look at three programs that will calculate and display the sum of natural numbers.

• The first program uses a while loop to calculate the sum.
• The second program computes the sum using a for loop.
• Third, the program takes the value of n (as entered by the user) and computes the sum of the n natural numbers.

## Example: Program to find the sum of natural numbers using while loop

``` public class Demo {

public static void main(String[] args) {

int num = 10, count = 1, total = 0;

while(count <= num)
{
total = total + count;
count++;
}

System.out.println("Sum of first 10 natural numbers is: "+total);
}
}```

Output:

Sum of first 10 natural numbers is: 55

## Example 2: Program to calculate the sum of natural numbers using for loop

``` public class Demo {

public static void main(String[] args) {

int num = 10, count, total = 0;

for(count = 1; count <= num; count++){
total = total + count;
}

System.out.println("Sum of first 10 natural numbers is: "+total);
}
}```

Output:

Sum of first 10 natural numbers is: 55

## Example 3: Program to find sum of first n (entered by user) natural numbers

``` public class Demo {

public static void main(String[] args) {

int num, count, total = 0;

System.out.println("Enter the value of n:");
//Scanner is used for reading user input
Scanner scan = new Scanner(System.in);
//nextInt() method reads integer entered by user
num = scan.nextInt();
//closing scanner after use
scan.close();
for(count = 1; count <= num; count++){
total = total + count;
}

System.out.println("Sum of first "+num+" natural numbers is: "+total);
}
}
```

Output:

Enter the value of n:
20
Sum of first 20 natural numbers is: 210

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