Java Program to Multiply Two Numbers
In this program, you'll learn to store and multiply two integer numbers in Java. After multiplication, the final value is displayed on the screen.
To understand this example, you should have the knowledge of the following Java programming topics:
Multiply Two Numbers
A Java program that multiply two numbers given by the user is as follows:
Example 1: Program to Multiply Two Integers
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in); // create an object of Scanner
System.out.print("Enter two numbers: "); // take input from the user
int first = input.nextInt();
int second = input.nextInt();
System.out.println("Entered numbers are: " + first + " " + second);
// multiply two numbers
int multiplication = first * second;
System.out.println("Multiplication: " + first + " * " + second + " = " + multiplication);
input.close();
}
}Output
Enter two numbers: 10 2
Entered numbers are: 10 2
Multiplication: 10 * 2 = 20Just like the previous program of addition,
first and second are multiplied using the * operator, and its result is stored in another variable multiplication.
And then, multiplication along with some string concatenation is printed on the screen using println() function.
Don't know how to take input from the user ? Look at this examples
Here two input numbers are taken from user one after another with space in between them which distinguish between two different inputs, this useful behavior is because of the default settings of Scanner called as Delimiter, learn more here.
Example 2: Program to Multiply Two Decimal Numbers
Multiplication can be performed between positive, negative numbers as well.
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in); // create an object of Scanner
System.out.print("Enter two numbers: "); // take input from the user
double first = input.nextDouble();
double second = input.nextInt();
System.out.println("Entered numbers are: " + first + " " + second);
// multiply two numbers
double multiplication = first * second;
System.out.println("Multiplication: " + first + " * " + second + " = " + multiplication);
input.close();
}
}Output
Enter two numbers: -13.0 2.3
Entered numbers are: -13.0 2.3
Multiplication: -13.0 * 2.3 = -29.9Datatype of variable multiplication is double, because the result of multiplying two numbers having data type double is double.
Note: Here, the output multiplication is negative, because these operations follow standard mathematical rules.
Try Yourself
- Three Numbers: Modify the program to multiply three numbers.
- Zero: What happens if you multiply any number by 0?
- Negative: Multiply a positive number by a negative number. Is the result negative?
- Mixed Types: Try multiplying an
intby adouble. What is the result type? - Brain Twister: Calculate
100000 * 100000usingintvariables. Does it print the correct value? If not, why? (Hint:intrange).