In this post, we will develop a java program to calculate the sum of n natural numbers. In this program, we have used while loop to find the sum of natural numbers in Java. While loop is a pre-test loop where the expression is evaluated then only statements are executed.

It uses a test expression to control the loop.

### Sum Of Three Numbers Example Java Program

Before every iteration of the loop, the test expression is evaluated. We can also use for loop instead of using a while loop. The for loop is also a pre-test loop, where first of all initialization expression is evaluated then the condition is checked and if the condition is true then only the statements of the for loop are executed. It is the best way to find the sum of natural numbers. The time complexity of this method is O 1. We already developed java program to find the sum of the natural number using for loop, or while loop, or without using the loop.

Now we will find the same using the recursion technique. In Recursion, We divided the big problems into smaller problems or sub-problems. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Skip to content In this post, we will develop a java program to calculate the sum of n natural numbers. Leave a Reply Cancel reply.During these challenging times, we guarantee we will work tirelessly to support you.

We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what. Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities. We will get through this together. Finding the sum of two numbers is simple, but it can get tedious if the numbers are big.

Here is how you can create a Java program to find the sum of two numbers. Log in Facebook Loading Google Loading Civic Loading No account yet?

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### Sum of Digits of a Number in Java

Learn why people trust wikiHow. Author Info Updated: January 8, To create this article, volunteer authors worked to edit and improve it over time. This article has also been viewedtimes. Learn more Explore this Article Steps. Tips and Warnings. Related Articles. Plan your program. Finding the sum of two numbers isn't difficult, but it is always a good practice to plan your program before beginning to code. Write the code. Finding the sum of two numbers means the simple addition of both the numbers.

## Java Program for Sum the digits of a given number

Create a separate variable to store the value of the sum. This can be of the type int.In this post, we will write a program to find the sum of digits of an integer number in Java. We can use the while loop or for loop to write the program.

Later we will also develop another java program to calculate the sum of digits without using the loop. In this Java program, we have used a while loop to find the sum of digits of a given integer number. While loop is a pre-test loop where the expression is evaluated then only statements are executed.

It uses a test expression to control the loop.

**4.1. Sum of Numbers - Java**

Before every iteration of the loop, the test expression is evaluated. We can find the last digit of the number and then add it to the sum variable using one line. It will reduce the number of line of the method which is using while loop.

Instead of using the while loop, we can also use for loop or do-while loop to find the sum of digits of a given integer number in java. The for loop in is also a pre-test loop, where first of all initialization expression is evaluated then the condition is checked and if the condition is true then only the statements of the for loop are executed. So in the above program, we can reduce the number of lines in the for loop. We can find the sum of digits in java without using any loop.

For this purpose, we need to take the help of recursion technique. A method that calls itself is called the recursive function. Recursion is one the way to find the solution to the program. In the below program, we developed a recursive method digitSumthis method finds the sum of the digits of a given number by using the recursion technique.

The if-else statement is used to write the condition and statement for the base and general case. We can also use the ternary operator. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Skip to content In this post, we will write a program to find the sum of digits of an integer number in Java.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to write a java method sumAll which takes any number of integers and returns their sum.

Use var args. You could do, assuming you have an array with value and array length: arrayVal[i]arrayLength :.

Learn more. Java method to sum any number of ints Ask Question. Asked 6 years, 10 months ago. Active 2 years, 4 months ago. Viewed k times. Active Oldest Votes. You need: public int sumAll int Daniel 2, 9 9 gold badges 20 20 silver badges 27 27 bronze badges. Azad Azad 4, 17 17 silver badges 38 38 bronze badges.

Thank you! Can we do this in less than O n time? Gabriel Gabriel 1, 12 12 silver badges 14 14 bronze badges. Bhesh Gurung Bhesh Gurung Thank you. Use var args public long sum int Jigar Joshi Jigar Joshi k 39 39 gold badges silver badges bronze badges. Missing something Return type had to be int. Does int Bob Dalgleish 7, 3 3 gold badges 27 27 silver badges 38 38 bronze badges. Alexey Malev 5, 4 4 gold badges 28 28 silver badges 48 48 bronze badges.

Arjjun Arjjun 1 1 silver badge 6 6 bronze badges. Consider adding the method signature to improve answer quality. You do not need a variable for array length, you have this value in your array. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.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. Using Arrays. How this program works: we are using arrays to store the values first. 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.

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. Using Static Method. Another example program using the static method.

How to calculate? Just summing of two numbers or three numbers or up to N numbers. Sum Of N Numbers Program 1. Scanner. Enter how many numbers you want sum.

Enter the 4 numbers. Java Tutor. Copyrighted Protected.In this post, we will develop a Java program to check whether the given number is spy number or not? We will also develop a Java program to find all the spy number exist in between two given numbers. Similarly, is also a spy number. Initialize the sum variable with 0 and the product variable with 1.

We can also find all spy number which exists between two given numbers. For this, we need to use a loop. Enter minimum value of range: 1 Enter maximum value of range: The Spy number from 1 to are: 1 2 3 4 5 6 7 8 9 22 Enter minimum value of range: Enter maximum value of range: The Spy number from to are: Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Skip to content In this post, we will develop a Java program to check whether the given number is spy number or not? A number whose sum of the digits of is equal to the product of its digits is called Spy number. Enter an integer number is not a Spy number. Java program to find all spy number in a given range We can also find all spy number which exists between two given numbers. Leave a Reply Cancel reply.Notifications Mark All Read. In this article we will perform addition on natural numbers in a given range.

So for this, we have to ask the user to enter two numbers which will denote the starting and ending of the range for adding all natural numbers between that range. So we create a java program to calculate the sum of all natural numbers in a given range. Step 1 : Ask the user to enter two numbers which will denote the starting and ending of the range for adding all natural numbers between that range.

Step 2 : Declare a variable to store the addition and initialize it with 0. Step 3 : Use a loop to perform iterations for adding all natural numbers from starting range to the ending range.

Notifications Please login. Program to find the sum of numbers in a given range in Java August 23, Sum of numbers in a given range : In this article we will perform addition on natural numbers in a given range. Working :. Step 4 : Use a statement for addition purpose. Step 5 : Print the result. Code in Java :. Output :. Enter starting number : 1 Enter ending number : 5 Sum of numbers in the range from 1 to 5 is 15 Enter starting number : 2 Enter ending number : 14 Sum of numbers in range 2 to 14 is

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