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C++ Program to find Number Combination

Posted in C++ Tutorial
Updated on Oct 27, 2024
By Mari Selvan
πŸ‘οΈ 111 - Views
⏳ 4 mins
πŸ’¬ 1 Comment
C++ Program to find Number Combination

Photo Credit to CodeToFun

πŸ™‹ 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 C++ program that efficiently generates combinations of two specified numbers within a given range.

πŸ“„ Example

Let's take a look at the C++ code that achieves this functionality.

generateCombinations.cpp
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#include <iostream>

// Function to calculate the number of digits in a number
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
void generateCombinations(int number1, int number2, int limit) {
  std::cout << "List of combinations of " << number1 << " and " << number2 << " up to " << limit << ":\n";

  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) {
      std::cout << i << " ";
    }
  }

  std::cout << "\n";
}

// Driver program
int main() {
  // 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);

  return 0;
}

πŸ’» Testing the Program

To test the program with different values, replace the values of targetNumber1, targetNumber2, and combinationLimit in the main function.

Output
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.

🧠 How the Program Works

  1. The program defines a function countDigits to calculate the number of digits in a given number.
  2. The function generateCombinations generates combinations of two specified numbers up to a given limit.
  3. Inside the function, it iterates through numbers from 1 to the specified limit.
  4. For each iteration, it checks if the current number contains only the specified digits.
  5. If the condition is met, the current number is a combination, and it is printed.

🧐 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.

🎒 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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Author

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πŸ‘‹ Hey, I'm Mari Selvan

For over eight years, I worked as a full-stack web developer. Now, I have chosen my profession as a full-time blogger at codetofun.com.

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Mari Selvan
Mari Selvan
10 months ago

If you have any doubts regarding this article (C++ Program to find Number Combination), please comment here. I will help you immediately.

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