Program to check whether the given number is armstrong or not.

Algorithm:

Step 1: Read a number, num.

Step 2: Assign temp=num.

Step 3: Assign sum=0.

Step 4: Repeat steps 5,6&7 until temp=0 reaches.

Step 5: Compute digit=temp%10.

Step 6: Compute temp=temp/10.

Step 7: Compute sum=sum+(digit**3).

Step 8: If num==sum goto step 9 else goto step 10.

Step 9: Print num is an Armstrong number.

Step 10: Print num is not an Armstrong number.

Step 11: Stop

Flowchart: 

Program code:

num=int(input('Enter any number '))
temp=num
sum=0
while temp>0:
    digit=temp%10
    temp=temp/10
    sum=sum+(digit**3)
if num==sum:
        print num,'is an Armstrong number'
else:
        print num,'is not a Armstrong number'