Armstrong Numbers in C

According to the concept of armstrong numbers a number is a armstrong number when a number is equal to the sum of it’s own digits raised to the power of the number of digits it contains. For example numbers like 153(1^3+5^3+3^3), 407(4^3+0^3+7^3) etc. In this article we are going to print all armstrong numbers in the given range.

C Program to Print all Armstrong Numbers

Let’s write a C program that prints all armstrong number in the given range.

#include <stdio.h>
#include <math.h>
void main()
{
    int start, end;
    printf("Enter the start of range");
    scanf("%d", &start);
    printf("Enter the end of range");
    scanf("%d", &end);
    for (int i = start; i <= end; i++)
    {
        int num = i;
        int sum = 0;
        int digits = (int)log10(num) + 1;
        while (num > 0)
        {
            int digit = num % 10;
            sum = sum + pow(digit, digits);
            num = num / 10;
        }
        if (sum == i)
        {
            printf("%d  ", i);
        }
    }
}

Output

Happy Coding

See Also

• Fibonacci Series in C
• Find the Largest of n Numbers Using the C Program