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An Armstrong number is an n-digit number whose sum of digits raised to the nth power equals the number itself.

Take, for example, the Armstrong number 153, which is a three-digit number; 1^3 + 5^3 + 3^3 equals 1 + 125 + 27, which equals 153.

A program to find Armstrong numbers between 1 and 500 is provided below.

#include<stdio.h>
#include<math.h>

int main()
{
    
    int n,sum,i,t,a;
    printf("\nThe Armstrong numbers in between 1 to 500 are : \n");

    for(i = 1; i <= 500; i++)
    {
        t = i;  // as we need to retain the original number
        sum = 0;
        while(t != 0)
        {
            a = t%10;
            sum += a*a*a;
            t = t/10;
        }

        if(sum == i)
        printf("\n\t%d", i);
    }

   
    return 0;
}

Output:

The Armstrong numbers in between 1 to 500 are : 

 1
 153
 370
 371
 407

Note: also read about the Miscellaneous Program(reverse the case of input string)

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