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Java Program to find Number Combination
Photo Credit to CodeToFun
π Introduction
In the realm of programming, creating combinations of numbers is a common and useful task. A combination is a selection of items from a collection, where the order of selection does not matter.
In this tutorial, we'll explore a Java program that generates combinations of two specified numbers within a given range.
π Example
Let's take a look at the Java code that achieves this functionality.
public class NumberCombinations {
// Function to calculate the number of digits in a number
static int countDigits(int num) {
int count = 0;
while (num != 0) {
num /= 10;
++count;
}
return count;
}
// Function to generate combinations of two numbers up to a specified limit
static void generateCombinations(int number1, int number2, int limit) {
System.out.printf("List of combinations of %d and %d up to %d:%n", number1, number2, limit);
for (int i = 1; i <= limit; ++i) {
int currentNumber = i;
// Check if the current number contains only the specified digits
while (currentNumber > 0) {
int digit = currentNumber % 10;
if (digit != number1 && digit != number2) {
break;
}
currentNumber /= 10;
}
// If the current number contains only the specified digits, print it
if (currentNumber == 0) {
System.out.print(i + " ");
}
}
System.out.println();
}
// Driver program
public static void main(String[] args) {
// Replace these values with your desired numbers and limit
int targetNumber1 = 4;
int targetNumber2 = 8;
int combinationLimit = 500;
// Call the function to generate combinations
generateCombinations(targetNumber1, targetNumber2, combinationLimit);
}
}
π» Testing the Program
To test the program with different values, replace the values of targetNumber1, targetNumber2, and combinationLimit in the main method.
List of combinations of 4 and 8 up to 500: 4 8 44 48 84 88 444 448 484 488
Compile and run the program to see the list of combinations.
π§ How the Program Works
- The program defines a class NumberCombinations containing static methods to calculate the number of digits and generate combinations of two specified numbers.
- Inside the generateCombinations method, it iterates through numbers from 1 to the specified limit.
- For each iteration, it checks if the current number contains only the specified digits.
- If the condition is met, the current number is a combination, and it is printed.
π§ Understanding the Concept of Number Combination
Before delving into the code, let's take a moment to understand the concept of combinations. In mathematics, a combination is a selection of items from a collection, where the order of selection does not matter.
For example, consider the specified numbers as 4 and 8. The combinations of 4 and 8 up to 500 include 4, 8, 44, 48, 84, 88, 444, 448, 484, and 488.
π’ Optimizing the Program
While the provided program is effective, you can explore and implement optimizations based on specific requirements or constraints.
Feel free to incorporate and modify this code as needed for your specific use case. Happy coding!
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