what are armstrong numbers??

Answer 1

Armstrong Numbers are three digit numbers whose sum of cubes of Individual digits is equal to the number itself.
say for e.g. 135
1^3+3^3+5^3= 135.
So it's an Armstrong Number.

If you wanted the logic to know whether a number is Armstrong or not then:
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//where x is the number to be checked
int th=x/100;
int hu=(x%100)/10;
int one=x%10;

int sum=th^3+hu^3+one^3;

if (sum==x)
cout<<"Number is Armstrong Number";
...

Answer 2

Armstrong Numbers need not be a three digit number.
ex: for any number
number=(first digit)^number of digits+.......