# Java number calculation using while loop

In this tutorial, you will learn how to use while loop to solve certain number calculations.

In this tutorial, you will learn how to use while loop to solve certain number calculations.

## Java number calculation using while loop

In this tutorial, you will learn how to use while loop to solve certain number calculations. Here is an example that prompts the user to input two integers : FirstNum and secondNum.( FirstNum must be less than secondNum.) and output all the odd numbers between firstNum and secondNum inclusive. It also find the sum of all the even numbers between FirstNum and secondNum inclusive and display all the numbers and their squares between 1-10. Moreover, it also calculates the sum of the squares of all the odd numbers between firstNum and secondNum inclusive.

Example:

```import java.util.*;
public class NumberExample{
public static void main(String[]args){
int sum=0,sumSquares=0;
int num1=0,num2=0;
Scanner input=new Scanner(System.in);
System.out.print("Enter First Number: ");
num1=input.nextInt();

System.out.print("Enter Second Number: ");
num2=input.nextInt();

if(num1>num2){
num1=input.nextInt();
}
else{
System.out.println("Odd Numbers: ");
while(num1 <= num2) {
if(num1%2 != 0) {
System.out.println(num1);
sumSquares+=(num1*num1);
}
if(num1%2 == 0) {
sum+=num1;
}
num1++;
}
System.out.println("Sum Of Even Numbers: "+sum);
System.out.println("Numbers and their squares between 1 and 10");
int i=1;
while(i <= 10) {
System.out.println(i+" "+(i*i));
i++;
}
System.out.println("Sum Of square of odd Numbers: "+sumSquares);
}
}
}
```

Output:

```Enter First Number: 4
Enter Second Number: 20
Odd Numbers:
5
7
9
11
13
15
17
19
Sum Of Even Numbers: 108
Numbers and their squares between 1 and 10
1    1
2    4
3    9
4    16
5    25
6    36
7    49
8    64
9    81
10    100
Sum Of square of odd Numbers: 1320

```