Is Armstrong number

#1

This is my code it is giving correct output but some test cases aren’t passed can i know why

#2

you are using a single variable num
and changing the value of num
after this loop

while(num>0){

        r = num%10;

        num /=10;

        sum += pow(r, digit);

    }

num will be zero hence you lose the original number
so further operations will not be done

Correct Way is to make a seperate variable
Modified Code