import java.util.Scanner;
class AddNumbers {
public static void main(String args[]) {
int x, y, z;
System.out.println("Enter two integers to calculate their sum ");
Scanner in = new Scanner(System.in);
x = in.nextInt();
y = in.nextInt();
z = x + y;
System.out.println("Sum of entered integers = " + z);
}
}
//For Large Number
import java.util.Scanner;
import java.math.BigInteger;
class AddingLargeNumbers {
public static void main(String[] args) {
String number1, number2;
Scanner in = new Scanner(System.in);
System.out.println("Enter first large number");
number1 = in.nextLine();
System.out.println("Enter second large number");
number2 = in.nextLine();
BigInteger first = new BigInteger(number1);
BigInteger second = new BigInteger(number2);
BigInteger sum;
sum = first.add(second);
System.out.println("Result of addition = " + sum);
}
}Let’s have a look at two programs. One adds two integers, the other uses BigInteger to add large numbers.
Explanation of AddNumbers Step-by-Step
1. Import the Scanner class:
Import java.util.Scanner;
This statement imports the Scanner class from the package java.util and lets us read input from the user.
2. Class Declaration:
class AddNumbers {
This is a class called AddNumbers. The class contains the code to add two numbers.
3. Declaration of the Main Method:
public static void main(String args[]) {
The primary method is the entry point of the program where execution starts.
4. Declare variables:
x, y, z;int
Declare three integer variables: x, y, and z.
Input two integers in the variables x and y.
The sum of x and y will be stored in the variable z.
5. Ask for user input:
System.out.println(“Enter two integers to calculate their sum”);
Prints out a message to prompt the user to enter two integers.
6. Scanner object to read from console:
Scanner in = new Scanner(System.in);
This is a Scanner object called in that reads from the console, reading input from the user.
7. Input for x and y:
x = in.nextInt();
y = in.nextInt();
These lines take two integer numbers from the input and assign them to x and y.
8. Add both numbers:
z = x + y;
In this step, it adds both values of x and y in the variable z.
9. Output :
System.out.println(“Sum of entered integers = ” + z)
This statement prints the sum of x and y by printing the value of z.
10. Example of Program Execution
If the user types in:
x = 10
y = 20
Output:
Input two integers to add them
10
20
Sum of the input integers = 30
Step-by-step Explanation for AddingLargeNumbers:
1. Import the Scanner and BigInteger classes:
import java.util.Scanner;
import java.math.BigInteger;
- The Scanner class is used to read user input.
- The BigInteger class from java.math is used to handle large integers beyond the range of primitive data types like int and long.
2. Class Declaration:
class AddingLargeNumbers {
This defines a class named AddingLargeNumbers, which handles the addition of large numbers.
3. Main Method Declaration:
public static void main(String[] args) {
This is where the program starts executing.
4. Declare variables to input a string:
String number1, number2;
These two strings will hold the large number entered by the user as strings.
5. Create a Scanner object to scan input:
Scanner in = new Scanner(System.in);
A Scanner object is made to read user input from the console.
6. Ask the user to input the first large number
System.out.println(“Enter first large number”);
number1 = in.nextLine();
This accepts the first big number from the user and assigns the value to number1.
7. Accept input for the second big number
System.out.println(“Enter second big number”);
number2 = in.nextLine();
This accepts the second big number from the user and assigns the value to number2.
8. convert the input string to BigInteger
BigInteger first = new BigInteger(number1);
BigInteger second = new BigInteger(number2);
The BigInteger constructor is used to convert the input strings (number1 and number2) into BigInteger objects.
9. Add the two BigIntegers:
BigInteger sum = first.add(second);
The add() method of BigInteger is used to add the two large numbers and store the result in sum.
10. Print the result:
System.out.println(“Result of addition = ” + sum);
This prints the sum of the two large numbers.
11. Program Execution Example:
If the user enters:
number1 = “123456789123456789123456789”
number2 = “987654321987654321987654321”
Output:
Enter first large number
123456789123456789123456789
Enter second large number
987654321987654321987654321
Result of addition = 1111111111111111111111111110
Summary of Output:
For the first program AddNumbers, if the user inputs:
x = 10
y = 20
The output will be:
Enter two integers to calculate their sum
10
20
Sum of entered integers = 30
For the second program AddingLargeNumbers, if the user enters:
number1 = “123456789123456789123456789”
number2 = “987654321987654321987654321”
The output will be:
Enter first large number
123456789123456789123456789
Enter second large number
987654321987654321987654321
Result of addition = 1111111111111111111111111110