Java program to calculate sum of odd and even numbers

Java program to calculate the sum of odd and even numbers

In this tutorial, we will discuss The Java program to calculate sum of odd and even numbers

In this article, we are going to learn the how to  calculate the sum of odd and even numbers in the Java program

 

What is even or odd numbers?

When any integer value which ends in 0,2,4,6,8 is divided by two it is called as an even number

Example for even numbers – 34,-64,78,788

When any integer value which ends in 0,1,3,5,7,9 is not divided by two it is called as an odd number

Example for odd numbers – 33,-69,75,785

 

We can use a modular operator to find odd or even number in the given range.

if n%2==0,  n is an even number

if n%2==1,  n is an odd number

 

Calculate the sum of odd and even numbers using for loop

Program 1

This program allows the user to enter a maximum number of digits and then, the program will sum up to odd and even numbers from 1 to entered digits using a for loop.

import java.util.Scanner;
class OddEvenSum{
public static void main (String args[]){
int i,num;  //declare variable i,num
int oddSum=0,evenSum=0;
//declare and initialize variables oddSum,evenSum

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number for num: \n");
num=scan.nextInt();//reads num1 from user

for(i=1; i<=num; i++){  
if(i%2==0) 
    evenSum=evenSum+i;
else
    oddSum=oddSum+i;
}
System.out.println("Sum of all odd numbers are: "+oddSum);
System.out.println("Sum of all even numbers are: "+evenSum);
}
}

When the above code is executed, it produces the following results

Enter the number for num:
10
Sum of all odd numbers are: 25
Sum of all even numbers are: 30

 

Calculate the sum of odd and even numbers using while loop

Program 2

This program allows the user to enter a maximum number of digits and then, the program will sum up to odd and even numbers  from 1 to entered digits using a while loop.

import java.util.Scanner;
class OddEvenSumWhile{
public static void main (String args[]){
int i,num;  //declare variable i,num
int oddSum=0,evenSum=0;
//declare and initialize variables oddSum,evenSum

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number for num: \n");
num=scan.nextInt();//reads num1 from user

i=1;
while(i<=num){  
if(i%2==0) 
    evenSum=evenSum+i;
else
    oddSum=oddSum+i;
 i++
}
System.out.println("Sum of all odd numbers are: "+oddSum);
System.out.println("Sum of all even numbers are: "+evenSum);
}
}

 

When the above code is executed, it produces the following results

Enter the number for num:
100
Sum of all odd numbers are: 2500
Sum of all even numbers are: 2550

 

Calculate the sum of odd and even numbers using do-while loop

Program 3

This program allows the user to enter a maximum number of digits and then, the program will sum up to odd and even numbers from 1 to entered digits using a do-while loop.

import java.util.Scanner;
class OddEvenSumDoWhile{
public static void main (String args[]){
int i,num;  //declare variable i,num
int oddSum=0,evenSum=0;
//declare and initialize variables oddSum,evenSum

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number for num: \n");
num=scan.nextInt();//reads num1 from user

i=1;
do{  
if(i%2==0) 
    evenSum=evenSum+i;
else
    oddSum=oddSum+i;
 i++;
}while(i<=num);
System.out.println("Sum of all odd numbers are: "+oddSum);
System.out.println("Sum of all even numbers are: "+evenSum);
}
}

 

When the above code is executed, it produces the following results

Enter the number for num:
50
Sum of all odd numbers are: 625
Sum of all even numbers are: 650

 

 

 

Suggested for you

for loop in Java

while loop in Java

if statements in Java

 

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