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C Program to Check Perfect Number

Posted in C Tutorial
Updated on Oct 06, 2024
By Mari Selvan
πŸ‘οΈ 139 - Views
⏳ 4 mins
πŸ’¬ 1 Comment
C Program to Check Perfect Number

Photo Credit to CodeToFun

πŸ™‹ Introduction

In the realm of programming, exploring the properties of numbers is a fascinating task. One such special type of number is a perfect number.

A perfect number is a positive integer that is equal to the sum of its proper divisors (excluding itself).

In this tutorial, we will delve into a C program designed to check whether a given number is a perfect number.

The program involves finding the sum of the proper divisors and comparing it with the original number.

πŸ“„ Example

Let's delve into the C code that accomplishes this task.

isPerfectNumber.c
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#include <stdio.h>

// Function to check if a number is a perfect number
int isPerfectNumber(int number) {
  int sum = 0;

  // Iterate through potential divisors up to number/2
  for (int i = 1; i <= number / 2; ++i) {
    // Check if i is a divisor of the number
    if (number % i == 0) {
      sum += i; // Add the divisor to the sum
    }
  }

  // If the sum of divisors is equal to the number, it is a perfect number
  return (sum == number);
}

// Driver program
int main() {
  // Replace this value with the number you want to check
  int number = 28;

  // Call the function to check if the number is a perfect number
  if (isPerfectNumber(number))
    printf("%d is a perfect number.\n", number);
  else
    printf("%d is not a perfect number.\n", number);

  return 0;
}

πŸ’» Testing the Program

To test the program with different numbers, modify the value of number in the main program.

Output
28 is a perfect number.

Compile and run the program to check if the specified number is a perfect number.

🧠 How the Program Works

  1. The program defines a function isPerfectNumber that takes an integer number as input and returns 1 (true) if the number is a perfect number, and 0 (false) otherwise.
  2. Inside the main program, replace the value of number with the desired number you want to check.
  3. The program calls the isPerfectNumber function and prints the result.

πŸ“ Between the Given Range

Let's delve into the C code that identifies perfect numbers in the specified range.

isPerfectNumber.c
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#include <stdio.h>

// Function to check if a number is perfect
int isPerfectNumber(int num) {
  int sum = 0;
  for (int i = 1; i <= num / 2; ++i) {
    if (num % i == 0) {
      sum += i;
    }
  }
  return (sum == num);
}

// Driver program
int main() {
  printf("Perfect Numbers in the range 1 to 50:\n");

  for (int i = 1; i <= 50; ++i) {
    if (isPerfectNumber(i)) {
      printf("%d ", i);
    }
  }

  printf("\n");

  return 0;
}

πŸ’» Testing the Program

Output
Perfect Numbers in the range 1 to 50:
6 28 

To test the program, simply compile and run it. The output will display the perfect numbers in the range from 1 to 50.

🧠 How the Program Works

  1. The program defines a function isPerfectNumber that checks if a given number is a perfect number.
  2. Inside the function, it iterates through numbers from 1 to half of the given number, summing up the proper divisors.
  3. The main function tests the range from 1 to 50 and prints the perfect numbers.

🧐 Understanding the Concept of Perfect Number

Before delving into the code, let's understand the concept of perfect numbers. A perfect number is a positive integer that is equal to the sum of its proper divisors (excluding itself).

🎒 Optimizing the Program

While the provided program is effective, consider exploring and implementing alternative approaches or optimizations for checking perfect numbers.

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
11 months ago

If you have any doubts regarding this article (C Program to Check Perfect Number) please comment here. I will help you immediately.

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