Any three digit number is called an Armstrong number of sum of cube of its digits equals the number itself. In order to check if a number satisfies this condition, each digit from it is successively separated from right and its cube is cumulatively added. In the end if the sum is found to be equal to original number, it is called Armstrong number.
Following Python code prints all armstrong numbers between 100 to 999
for num in range(100,1000): temp=num sum=0 while temp>0: digit=temp%10 sum=sum+digit**3 temp=temp//10 if sum==num: print (num)
The output is list of armstrong numbers
153 370 371 407