Armstrong Number in C

Armstrong Number

An Armstrong number is a number such that the sum of its digits raised to the power n(number of digit in a number) is the number itself.

Example:

153 because 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153.

Understanding of Program:

• Firstly, we have to take input a number from a user.
• Find the number of digits in the number with the help of the first "while loop" in the program.
• Now, Find the n-power of the each digit of the number and sum it all.
• At last, If the resultant number is equal to the number taken by the user, then it is an Armstrong number else it is not.

Program in C

#include<stdio.h>

#include<math.h>

void main()

{

  int num,temp,i,n=0,rem,result=0;

  printf("enter the number:\n");

  scanf("%d",&num);

  temp=num;

  while(temp>0)

   {

     temp=temp/10;

     n++;

   }

    temp=num;

    while(temp!=0)

    {

       rem=temp%10;

       result=result+pow(rem,n);

       temp=temp/10;

     }

    if(result==num)

         printf("Number is an Armstrong number");

     else

         printf("Number is not an Armstrong number");

}

OUTPUT

Enter the number:

153

Number is an Armstrong number