Here is a complete tutorial on how to write a program for Armstrong Number with C++ and Python. An Armstrong is an n digits number whose sum of digits raised to the power n is equal to itself. For example, 153 is an Armstrong number because it is a 3-digit number and the sum of each digit raised to the power 3 is equal to 153. (1) ³ +(5) ³ +(3) ³ = 1+125+27 = 153

C++:

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

void main()
{
clrscr();
int num, m=0, power=0, x,temp;
cout<<"Enter a Number: ";
cin>>num;
temp = num;
while(temp!=0)
{
  temp = temp/10;
  power++;
}
temp = num;
while(num!=0)
{
  x =num%10;
  m+= pow(x,power);
  num= num/10;
}
if(temp == m)
cout<<temp <<" is an Armstrong number";
else
cout<<temp <<" is not an Armstrong number";
getch();
}

Output

Enter a number: 54748
54748 is an Armstrong number

Python:

num = int(input("Enter a number: "))
temp = num
power = 0
m = 0
while(temp!=0):
                temp = temp//10
                power += 1
temp = num
while(num!=0):
                x = num%10
                m += x**power
                num = num//10

if temp==m:
                print(temp,"is an Armstrong number")

else:
                print(temp,"is not an Armstrong number")

Output

Enter a number: 153
153 is an Armstrong number

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