### C# Basic

### C# Interview Programs

- C# Interview Programs
- C# Abundant Number
- C# Amicable Number
- C# Armstrong Number
- C# Average of N Numbers
- C# Automorphic Number
- C# Biggest of three numbers
- C# Binary to Decimal
- C# Common Divisors
- C# Composite Number
- C# Condense a Number
- C# Cube Number
- C# Decimal to Binary
- C# Decimal to Octal
- C# Disarium Number
- C# Even Number
- C# Evil Number
- C# Factorial of a Number
- C# Fibonacci Series
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- C# Odd Number
- C# Palindrome Number
- C# Pascalβs Triangle
- C# Perfect Number
- C# Perfect Square
- C# Power of 2
- C# Power of 3
- C# Pronic Number
- C# Prime Factor
- C# Prime Number
- C# Smith Number
- C# Strong Number
- C# Sum of Array
- C# Sum of Digits
- C# Swap Two Numbers
- C# Triangular Number

# C# Program to Check Strong Number

Photo Credit to CodeToFun

## π Introduction

In the world of programming, exploring number properties is a fascinating journey. One such property is related to Strong Numbers.

A Strong Number (also known as a Digital Factorial) is a number in which the sum of the factorials of its digits is equal to the number itself.

In this tutorial, we'll delve into a C# program that checks whether a given number is a Strong Number or not.

## π Example

Let's take a look at the C# code that checks whether a given number is a Strong Number.

```
using System;
class Program {
// Function to calculate the factorial of a number
static int Factorial(int num) {
return (num == 0 || num == 1) ? 1 : num * Factorial(num - 1);
}
// Function to check if a number is a Strong Number
static bool IsStrongNumber(int num) {
int originalNum = num;
int sum = 0;
while (num > 0) {
int digit = num % 10;
sum += Factorial(digit);
num /= 10;
}
return (sum == originalNum);
}
// Driver program
static void Main() {
// Replace this value with your desired number
int number = 145;
// Call the function to check if the number is a Strong Number
if (IsStrongNumber(number)) {
Console.WriteLine($"{number} is a Strong Number.");
} else {
Console.WriteLine($"{number} is not a Strong Number.");
}
}
}
```

### π» Testing the Program

To test the program with different numbers, simply replace the value of number in the Main method.

145 is a Strong Number.

Run the program to check if the number is a Strong Number.

### π§ How the Program Works

- The program defines a function Factorial to calculate the factorial of a number. Another function IsStrongNumber is defined to check if a given number is a Strong Number.
- Another function IsStrongNumber is defined to check if a given number is a Strong Number.
- Inside the IsStrongNumber function, it iterates through each digit of the number, calculates the factorial, and adds it to the sum.
- The result is compared with the original number to determine if it is a Strong Number.

## π Between the Given Range

Let's take a look at the C# code that checks for strong numbers in the range of 1 to 200.

```
using System;
class Program {
// Function to calculate factorial of a number
static int Factorial(int n) {
if (n == 0 || n == 1)
return 1;
else
return n * Factorial(n - 1);
}
// Function to check if a number is a strong number
static bool IsStrongNumber(int num) {
int originalNum = num;
int sum = 0;
while (num > 0) {
int digit = num % 10;
sum += Factorial(digit);
num /= 10;
}
return sum == originalNum;
}
// Driver program
static void Main() {
Console.WriteLine("Strong Numbers in the Range 1 to 200:");
// Iterate through the range and check for strong numbers
for (int i = 1; i <= 200; i++) {
if (IsStrongNumber(i)) {
Console.Write(i + " ");
}
}
Console.WriteLine();
}
}
```

### π» Testing the Program

Strong Numbers in the Range 1 to 200: 1 2 145

Run the program to see the strong numbers in the range of 1 to 200.

### π§ How the Program Works

- The program defines a function Factorial to calculate the factorial of a number.
- It defines a function IsStrongNumber to check if a number is a strong number.
- The Main method iterates through the range from 1 to 200 and checks each number for being a strong number using the IsStrongNumber function.
- The program outputs the strong numbers found in the specified range.

## π§ Understanding the Concept of Strong Number

To determine if a number is a Strong Number, we need to calculate the factorial of each digit of the number and then sum these factorials. If the sum is equal to the original number, then it is a Strong Number.

For example, let's consider the number 145:

- The factorial of 1 is 1.
- The factorial of 4 is 24.
- The factorial of 5 is 120.

The sum of these factorials is 1 + 24 + 120 = 145, which is the original number. Hence, 145 is a Strong Number.

## π Conclusion

Understanding and implementing programs that check for mathematical properties, such as Strong Numbers, enhances problem-solving skills in programming. Feel free to modify and expand upon this code for your specific needs. Happy coding!

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